feat(smart-contracts): add stableswap support for provide liquidity

[nseguias]

Description and Motivation

This PR adds support for StableSwap pools when providing liquidity through the Pool Manager.

Related Issues

311

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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 83.91304% with 111 lines in your changes missing coverage. Please review.

Project coverage is 90.90%. Comparing base (1d6ffbc) to head (2f40957). Report is 36 commits behind head on release/v2_contracts.

Files	Patch %	Lines
...ontracts/liquidity_hub/pool-manager/sim/src/lib.rs	25.45%	82 Missing :warning:
...ontracts/liquidity_hub/pool-manager/src/helpers.rs	92.75%	20 Missing :warning:
...quidity_hub/pool-manager/src/liquidity/commands.rs	64.70%	6 Missing :warning:
...work/stableswap_3pool/src/stableswap_math/curve.rs	60.00%	2 Missing :warning:
...ty_hub/pool-manager/src/tests/integration_tests.rs	99.64%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/v2_contracts #351 +/- ## ======================================================== - Coverage 91.15% 90.90% -0.26% ======================================================== Files 279 280 +1 Lines 31119 31830 +711 ======================================================== + Hits 28368 28936 +568 - Misses 2751 2894 +143 ```

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[0xFable]

Test with diff amp factors on our integration test PR branch

[github-actions[bot]]

Schema generation had missing jobs:

Please run just schemas locally and upload the generated schemas.