Add support for custom mint decimals

[buffalu]

Feature:

• Adds support for custom mint decimals.

Cleanup:

• Rearranges some cli arguments into different module
• Auto-generate CLI documents using clap-markdown

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.92%. Comparing base (c2beade) to head (db42004). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #93 +/- ## ========================================== + Coverage 78.91% 78.92% +0.01% ========================================== Files 85 85 Lines 8436 8441 +5 ========================================== + Hits 6657 6662 +5 Misses 1779 1779 ```

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