Demonstrate Configuring Exported Static Values via Bazel Config Flags

This example now demonstrates how Claro programs can leverage Bazel's builtin functionality to satisfy arbitrary configuration needs without the language itself being burdened with syntax for such a thing. This is a demonstration of compile-time configurability that comes with no runtime overhead of checking flags and such as you'd find in other existing Guice-like dependency injection frameworks.

Now, if you'd like to point the Buggy Buggies AI demo server at a local instance of the Buggy Buggies server you can just run the following command to configure the dev build instead of the prod build (in a real project, defaults would probably be inverted):

```
$ bazel run //src/java/com/claro/claro_programs/demo_server/buggy_buggies:buggy_buggies_http_server --//src/java/com/claro/claro_programs/demo_server/buggy_buggies/buggy_buggies_service:env_flag=dev
```

See: https://bazel.build/docs/configurable-attributes.

WORKSPACE

@@ -69,6 +69,9 @@ load("@io_bazel_rules_closure//closure:repositories.bzl", "rules_closure_depende
 rules_closure_dependencies()
 rules_closure_toolchains()
 
+load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
+bazel_skylib_workspace()
+
 # See this documentation to understand how fetching Maven deps works in Bazel:
 # https://github.com/bazelbuild/rules_jvm_external
 # When you add a new maven dep run the following command to update new deps:

src/java/com/claro/claro_programs/demo_server/buggy_buggies/buggy_buggies_service/BUILD

@@ -1,16 +1,48 @@
 load("//src/java/com/claro:claro_build_rules.bzl", "claro_module")
+load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
 
+SRCS = ["buggy_buggies_move_response.claro"]
 
+# This example now demonstrates how Claro programs can leverage Bazel's builtin functionality to satisfy arbitrary
+# configuration needs without the language itself being burdened with syntax for such a thing. This is a demonstration
+# of compile-time configurability that comes with no runtime overhead of checking flags and such as you'd find in other
+# existing Guice-like dependency injection frameworks.
 claro_module(
     name = "buggy_buggies_client",
     module_api_file = "buggy_buggies_client.claro_module_api",
-    srcs = [
-        "buggy_buggies_client.claro",
-        "buggy_buggies_move_response.claro",
-    ],
+    srcs = select({
+        ":dev": ["buggy_buggies_client_DEV.claro"] + SRCS,
+        ":prod": ["buggy_buggies_client_PROD.claro"] + SRCS,
+    }),
     optional_stdlib_deps = ["http"],
     visibility = [
         "//src/java/com/claro/claro_programs/demo_server/buggy_buggies:__pkg__",
         "//src/java/com/claro/claro_programs/demo_server/buggy_buggies/endpoint_handlers:__pkg__",
     ],
-)
+)
+
+# For demonstration purposes only, I'm defining a brand new flag here, so that it's obvious where all of the moving
+# pieces in the above claro_module() target come from.
+#
+# If you want to actually override the default flag value, set following flag in your `bazel run` command:
+#   --//src/java/com/claro/claro_programs/demo_server/buggy_buggies/buggy_buggies_service:env_flag=dev
+string_flag(
+    name = "env_flag",
+    values = [
+        "dev",
+        "prod",
+    ],
+    build_setting_default = "prod",
+)
+config_setting(
+    name = "dev",
+    flag_values = {
+        ":env_flag": "dev"
+    }
+)
+config_setting(
+    name = "prod",
+    flag_values = {
+        ":env_flag": "prod"
+    }
+)

src/java/com/claro/claro_programs/demo_server/buggy_buggies/buggy_buggies_service/buggy_buggies_client_DEV.claro

@@ -0,0 +1,5 @@
+
+provider static_HTTP_CLIENT() -> HttpClient<BuggyBuggies> {
+  # This now only needs to happen once throughout the entire program.
+  return http::getHttpClient("http://localhost:4000");
+}

src/java/com/claro/intermediate_representation/expressions/term/IdentifierReferenceTerm.java

@@ -220,10 +220,6 @@ public Type getValidatedExprType(ScopedHeap scopedHeap) throws ClaroTypeExceptio
 
   @Override
   public StringBuilder generateJavaSourceBodyOutput(ScopedHeap scopedHeap) {
-    if (scopedHeap.getIdentifierData(this.identifier).isStaticValue) {
-      System.err.println(
-          "TESTING!!! FOUND STATIC ID REF: " + this.identifier + " " + this.optionalDefiningModuleDisambiguator);
-    }
     ScopedHeap.IdentifierData identifierData = scopedHeap.getIdentifierData(this.identifier);
     identifierData.used = true;
     return new StringBuilder(