feat: implement cmd to sign validator ownership

[j75689]

Description

feat: implement cmd to sign validator ownership

Rationale

bsc validator on bc can sign their sigs to prove the ownership to the new operator address on bsc after bc-fusion

Example

./build/tbnbcli validator-ownership sign-validator-ownership --bsc-operator-address 0x45737bAf95D995a963ab3a7c9AC66fC7A63ad76E --from test1 --chain-id Binance-Chain-Ganges

Changes

Notable changes:

• cmd

Preflight checks

• build passed (make build)
• tests passed (make test)
• integration tests passed (make integration_test)
• manual transaction test passed (cli invoke)

Already reviewed by

n/a

Related issues

n/a

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c3ab169) 48.80% compared to head (17f6bb4) 48.75%.
Report is 5 commits behind head on bc-fusion.

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Additional details and impacted files

@@              Coverage Diff              @@
##           bc-fusion    #1004      +/-   ##
=============================================
- Coverage      48.80%   48.75%   -0.05%     
=============================================
  Files            127      127              
  Lines          12811    12820       +9     
=============================================
- Hits            6252     6251       -1     
- Misses          6127     6138      +11     
+ Partials         432      431       -1     

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