feat: make it possible to lock the LP when providing liquidity into a pool

[kerber0x]

Description and Motivation

This PR addresses #309, allowing a user to lock the LP when providing liquidity.

Related Issues

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Checklist:

• [x] I have read Migaloo's contribution guidelines.
• [x] My pull request has a sound title and description (not something vague like Update index.md)
• [x] All existing and new tests are passing.
• [x] I updated/added relevant documentation.
• [x] The code is formatted properly cargo fmt --all --.
• [x] Clippy doesn't report any issues cargo clippy -- -D warnings.
• [x] I have regenerated the schemas if needed cargo schema.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.13678% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 89.80%. Comparing base (4f0d553) to head (27ec278). Report is 1 commits behind head on release/v2_contracts.

Files	Patch %	Lines
...acts/liquidity_hub/pool-manager/src/tests/suite.rs	77.41%	14 Missing :warning:
...ty_hub/pool-manager/src/tests/integration_tests.rs	99.16%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/v2_contracts #343 +/- ## ======================================================== + Coverage 89.67% 89.80% +0.12% ======================================================== Files 261 261 Lines 26905 27203 +298 ======================================================== + Hits 24128 24430 +302 + Misses 2777 2773 -4 ```

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