Fetch token prices & history using new Explorer BE endpoints (rebased and fixed)

[nop33]

This is @mvaivre's initial PR, rebased.

Fixes most subtasks of #243.

@nop33's subtasks:

• Rebase to latest master
• Use latest web3
• Update code to use latest explorer API
• Fix: Loading indication of total worth and chart is buggy
• Fix: Switching currency does not update chart
• Re-implement price polling
• Fix greeting message animation
• Compare loading speed with master and improve if needed

[changeset-bot]

🦋 Changeset detected

Latest commit: c04f2cf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
alephium-desktop-wallet	Patch

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[mvaivre]

Awesome job! 👏

[mvaivre]

Not directly linked to this PR but this could be extracted as well (I actually thought it was already). WDYT?

[mvaivre]

To be discussed later:

• For maintainability sake, we could use comments to describe what each constant does.
• Some constants would be in SHRD, those ones should IMO be imported and re-declared in each sub-package for clarity, instead of being imported directly in the code.

[nop33]

Hm, why should we re-declare them? We can easily click on the constant in our IDEs and navigate to the source where we could have the comments that you mentioned.

[mvaivre]

I find it pretty useful to see the list of constants actually in use in the project, makes it easier to know what can be tweaked. But yeah, it's a bit more maintenance involved.

[mvaivre]

Testing, everything looks pretty good. As expected, I'm not really happy with the amount / price history situation (lack of), but it's a temporary thing :)