feat(rust/cardano-blockchain-types): add cardano-blockchain-types crate

[stevenj]

Description

Creates a new crate to hold self-contained Cardano blockchain types.
This allows us to break an emerging circular dependency with the RBAC crate logic.

Related Issue(s)

Arose from: input-output-hk/catalyst-voices#1366
#108

Breaking Changes

The types are based on types in cardano chain follower, but not 100% identical in order to make them more generalized.

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

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 248/248}$ | ${\color{red}Fail: 0/248}$ |

[bkioshn]

LGTM