refactor(crosschain): rename GasPriceVoter to VoteGasPrice

[lumtis]

Everything in the title

Addressing this now since it complete a series of message renaming we recently did.

Closes: #1925

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.54%. Comparing base (637c62e) to head (3194f79).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2013   +/-   ##
========================================
  Coverage    68.54%   68.54%           
========================================
  Files          236      236           
  Lines        13620    13620           
========================================
  Hits          9336     9336           
  Misses        3834     3834           
  Partials       450      450           

Files	Coverage Δ
x/crosschain/keeper/msg_server_vote_gas_price.go	100.00% <100.00%> (ø)
x/crosschain/types/authz.go	100.00% <100.00%> (ø)
x/crosschain/types/message_vote_gas_price.go	100.00% <100.00%> (ø)
zetaclient/zetabridge/tx.go	52.65% <100.00%> (ø)

[github-actions]

!!!WARNING!!!
nosec detected in the following files: zetaclient/zetabridge/tx.go, x/crosschain/keeper/msg_server_vote_gas_price.go

Be very careful about using #nosec in code. It can be a quick way to suppress security warnings and move forward with development, it should be employed with caution. Suppressing warnings with #nosec can hide potentially serious vulnerabilities. Only use #nosec when you're absolutely certain that the security issue is either a false positive or has been mitigated in another way.

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[ws4charlie]

lgtm