proto(asset): add coingecko_id to Metadata (#5000)

## Describe your changes

This PR adds a field to `core.asset.v1.Metadata` to optionally augment
registry asset with a `coingecko_id`

## Issue ticket number and link

#4998

## Checklist before requesting a review

- [x] I have added guiding text to explain how a reviewer should test
these changes.

- [x] If this code contains consensus-breaking changes, I have added the
"consensus-breaking" label. Otherwise, I declare my belief that there
are not consensus-breaking changes, for the following reason:

  > Proto change

Author: erwanor

crates/core/asset/src/asset/denom_metadata.rs

@@ -68,6 +68,7 @@ impl From<&Inner> for pb::Metadata {
             images: inner.images.clone(),
             badges: inner.badges.clone(),
             priority_score: inner.priority_score,
+            coingecko_id: String::new(),
         }
     }
 }

crates/proto/src/gen/penumbra.core.asset.v1.rs

@@ -99,6 +99,9 @@ pub struct Metadata {
     /// For ibc assets, usually an image of the source chain.
     #[prost(message, repeated, tag = "1987")]
     pub badges: ::prost::alloc::vec::Vec<AssetImage>,
+    /// Coingecko ID for the asset.
+    #[prost(string, tag = "1988")]
+    pub coingecko_id: ::prost::alloc::string::String,
 }
 impl ::prost::Name for Metadata {
     const NAME: &'static str = "Metadata";

crates/proto/src/gen/penumbra.core.asset.v1.serde.rs

@@ -1253,6 +1253,9 @@ impl serde::Serialize for Metadata {
         if !self.badges.is_empty() {
             len += 1;
         }
+        if !self.coingecko_id.is_empty() {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("penumbra.core.asset.v1.Metadata", len)?;
         if !self.description.is_empty() {
             struct_ser.serialize_field("description", &self.description)?;
@@ -1286,6 +1289,9 @@ impl serde::Serialize for Metadata {
         if !self.badges.is_empty() {
             struct_ser.serialize_field("badges", &self.badges)?;
         }
+        if !self.coingecko_id.is_empty() {
+            struct_ser.serialize_field("coingeckoId", &self.coingecko_id)?;
+        }
         struct_ser.end()
     }
 }
@@ -1309,6 +1315,8 @@ impl<'de> serde::Deserialize<'de> for Metadata {
             "priority_score",
             "priorityScore",
             "badges",
+            "coingecko_id",
+            "coingeckoId",
         ];
 
         #[allow(clippy::enum_variant_names)]
@@ -1323,6 +1331,7 @@ impl<'de> serde::Deserialize<'de> for Metadata {
             Images,
             PriorityScore,
             Badges,
+            CoingeckoId,
             __SkipField__,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
@@ -1355,6 +1364,7 @@ impl<'de> serde::Deserialize<'de> for Metadata {
                             "images" => Ok(GeneratedField::Images),
                             "priorityScore" | "priority_score" => Ok(GeneratedField::PriorityScore),
                             "badges" => Ok(GeneratedField::Badges),
+                            "coingeckoId" | "coingecko_id" => Ok(GeneratedField::CoingeckoId),
                             _ => Ok(GeneratedField::__SkipField__),
                         }
                     }
@@ -1384,6 +1394,7 @@ impl<'de> serde::Deserialize<'de> for Metadata {
                 let mut images__ = None;
                 let mut priority_score__ = None;
                 let mut badges__ = None;
+                let mut coingecko_id__ = None;
                 while let Some(k) = map_.next_key()? {
                     match k {
                         GeneratedField::Description => {
@@ -1448,6 +1459,12 @@ impl<'de> serde::Deserialize<'de> for Metadata {
                             }
                             badges__ = Some(map_.next_value()?);
                         }
+                        GeneratedField::CoingeckoId => {
+                            if coingecko_id__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("coingeckoId"));
+                            }
+                            coingecko_id__ = Some(map_.next_value()?);
+                        }
                         GeneratedField::__SkipField__ => {
                             let _ = map_.next_value::<serde::de::IgnoredAny>()?;
                         }
@@ -1464,6 +1481,7 @@ impl<'de> serde::Deserialize<'de> for Metadata {
                     images: images__.unwrap_or_default(),
                     priority_score: priority_score__.unwrap_or_default(),
                     badges: badges__.unwrap_or_default(),
+                    coingecko_id: coingecko_id__.unwrap_or_default(),
                 })
             }
         }

crates/proto/src/gen/proto_descriptor.bin.no_lfs

@@ -71,6 +71,9 @@ message Metadata {
   // Associated icons for asset.
   // For ibc assets, usually an image of the source chain.
   repeated AssetImage badges = 1987;
+
+  // Coingecko ID for the asset.
+  string coingecko_id = 1988;
 }
 
 // DenomUnit represents a struct that describes a given denomination unit of the basic token.
@@ -101,7 +104,6 @@ message Balance {
   repeated SignedValue values = 1;
 }
 
-
 // Represents a value of a known or unknown denomination.
 message ValueView {
   // A value whose asset ID is known and has metadata.