refactor: remove proto getters

[robert-zaremba]

Description

closes: #1114

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Author Checklist

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please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• added appropriate labels to the PR
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[RafilxTenfen]

Does this need to go to changelogs?

[toteki]

No changelog needed in my opinion since observable behavior is unaffected

[robert-zaremba]

I will add changelog update

[toteki]

I added labels and changed type prefix to refactor (I had to go back and read the guide since my first thought was chore)

[robert-zaremba]

Thanks for quick review!

[robert-zaremba]

added labels

We don't need to add labels in PRs linked to issues. If PR is not linked to issue, then we can use it as a "task" by adding to a board - only then we need to add labels.

changed type prefix to refactor

Thanks, makes sense.

[codecov-commenter]

Codecov Report

Merging #1125 (637e39b) into main (c1a31c0) will not change coverage.
The diff coverage is 35.62%.

@@           Coverage Diff           @@
##             main    #1125   +/-   ##
=======================================
  Coverage   43.82%   43.82%           
=======================================
  Files          65       65           
  Lines        8393     8393           
=======================================
  Hits         3678     3678           
  Misses       4472     4472           
  Partials      243      243           

Impacted Files	Coverage Δ
x/leverage/client/cli/tx.go	0.00% <0.00%> (ø)
x/leverage/keeper/msg_server.go	0.84% <0.00%> (ø)
x/leverage/types/tx.go	0.00% <0.00%> (ø)
x/leverage/types/codec.go	41.93% <50.00%> (ø)
x/leverage/simulation/operations.go	92.66% <90.69%> (ø)
x/leverage/client/tests/tests.go	100.00% <100.00%> (ø)
x/leverage/keeper/keeper.go	43.92% <100.00%> (ø)
x/leverage/keeper/validate.go	51.61% <100.00%> (ø)