feat(rust/cardano-chain-follower): Auto-sync mithril snapshot

[stevenj]

Description

Automatically downloads and syncs from mithril snapshots.
Updates them locally when they are updated.
Informs the consumer about the update.

This is a breaking change from v0.0.1 because the behavior is now entirely different.

Also deserializes and processes CIP36 metadata, to simplify consumption of this data in the consumer.

Related Issue(s)

Closes input-output-hk/catalyst-voices#528

Breaking Changes

The API is not the same as the previous release due to the changed functionality of the crate.

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module