[chore] Move perpetuals/keeper helper functions to perpetuals/lib (backport #1678)

[mergify]

Changelist

Move x/perpetuals/keeper/perpetual.go helper functions to x/perpeptuals/lib for clarity. This is the first step in refactoring some of the margining functions for performance.

Test Plan

• Added new units tests (and benchmarks) for these functions which did not have unit tests before

Summary by CodeRabbit

• Refactor

  • Moved functions related to net notional, margin requirements, and settlement calculations to a new package for better modularity.

• Tests

  • Added benchmarking and testing functions for settlement, net notional, and margin requirement calculations.

• Style

  • Reordered and cleaned up import statements in test files.

---

This is an automatic backport of pull request #1678 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 87a919e has failed:

On branch mergify/bp/release/protocol/v5.1.x/pr-1678
Your branch is up to date with 'origin/release/protocol/v5.1.x'.

You are currently cherry-picking commit 87a919e6.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   protocol/daemons/liquidation/client/sub_task_runner.go
	modified:   protocol/x/perpetuals/keeper/perpetual_test.go
	new file:   protocol/x/perpetuals/lib/lib.go
	new file:   protocol/x/perpetuals/lib/lib_test.go
	modified:   protocol/x/subaccounts/keeper/subaccount.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   protocol/x/perpetuals/keeper/perpetual.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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