feat: add genesis txs subcommand

[zivkovicmilos]

Description

This PR introduces the genesis txs subcommand, as outlinedi n #1231.

Closes #1231

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (347f3c0) 47.56% compared to head (099ce29) 47.83%.

Additional details and impacted files

@@               Coverage Diff                @@
##           feat/genesis    #1278      +/-   ##
================================================
+ Coverage         47.56%   47.83%   +0.26%     
================================================
  Files               367      369       +2     
  Lines             62407    62739     +332     
================================================
+ Hits              29687    30012     +325     
- Misses            30295    30303       +8     
+ Partials           2425     2424       -1     

see 10 files with indirect coverage changes

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[gfanton]

lgtm 👍