Add router to pool-manager

[kaimen-sano]

Description and Motivation

Adds a router to the pool-manager, similar to the v1 pool router.

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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 97.70115% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 88.50%. Comparing base (eabfd9b) to head (e59999f). Report is 4 commits behind head on release/v2_contracts.

Files	Patch %	Lines
.../liquidity_hub/pool-manager/src/router/commands.rs	91.78%	6 Missing :warning:
...acts/liquidity_hub/pool-manager/src/tests/suite.rs	80.00%	5 Missing :warning:
...ts/liquidity_hub/pool-manager/src/swap/commands.rs	93.54%	2 Missing :warning:
...quidity_hub/pool-manager/src/liquidity/commands.rs	50.00%	1 Missing :warning:
...iquidity_hub/pool-manager/src/swap/perform_swap.rs	97.72%	1 Missing :warning:
packages/white-whale-std/src/pool_manager.rs	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/v2_contracts #295 +/- ## ======================================================== + Coverage 88.20% 88.50% +0.30% ======================================================== Files 250 252 +2 Lines 23424 24029 +605 ======================================================== + Hits 20660 21267 +607 + Misses 2764 2762 -2 ```

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