Feat/add remove swap routes

[nseguias]

Description and Motivation

This PR implements AddSwapRoutes and RemoveSwapRoutes so that the whale lair knows how to swap things back to WHALE when performing the buybacks.

It's permissionless, and once a route is added it cannot be overriden. It needs to be removed, and added again.

Only the user who added a route and the owner of the contract can remove a route.

Related Issues

315

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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)
• [ ] All existing and new tests are passing.
• [ ] 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.

[github-actions[bot]]

Schema generation had missing jobs:

contracts/liquidity_hub/pool-manager/schema/pool-manager.json
contracts/liquidity_hub/pool-manager/schema/raw/execute.json
contracts/liquidity_hub/pool-manager/schema/raw/query.json

Please run just schemas locally and upload the generated schemas.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.98496% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 89.67%. Comparing base (a8ebb95) to head (4f0d553). Report is 2 commits behind head on release/v2_contracts.

Files	Patch %	Lines
...ontracts/liquidity_hub/pool-manager/src/helpers.rs	57.89%	8 Missing :warning:
...ntracts/liquidity_hub/pool-manager/src/contract.rs	70.00%	3 Missing :warning:
...acts/liquidity_hub/pool-manager/src/tests/suite.rs	88.00%	3 Missing :warning:
...ontracts/liquidity_hub/pool-manager/src/queries.rs	81.81%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/v2_contracts #333 +/- ## ======================================================== + Coverage 89.49% 89.67% +0.17% ======================================================== Files 261 261 Lines 26646 26905 +259 ======================================================== + Hits 23848 24128 +280 + Misses 2798 2777 -21 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[github-actions[bot]]

Schema generation had missing jobs:

contracts/liquidity_hub/pool-manager/schema/pool-manager.json
contracts/liquidity_hub/pool-manager/schema/raw/execute.json
contracts/liquidity_hub/pool-manager/schema/raw/query.json

Please run just schemas locally and upload the generated schemas.

[github-actions[bot]]

Schema generation had missing jobs:

contracts/liquidity_hub/pool-manager/schema/pool-manager.json
contracts/liquidity_hub/pool-manager/schema/raw/execute.json
contracts/liquidity_hub/pool-manager/schema/raw/query.json

Please run just schemas locally and upload the generated schemas.

[github-actions[bot]]

Schema generation had missing jobs:

contracts/liquidity_hub/pool-manager/schema/pool-manager.json
contracts/liquidity_hub/pool-manager/schema/raw/execute.json
contracts/liquidity_hub/pool-manager/schema/raw/query.json

Please run just schemas locally and upload the generated schemas.

[github-actions[bot]]

Schema generation had missing jobs:

contracts/liquidity_hub/pool-manager/schema/raw/response_to_simulate_swap_operations.json
contracts/liquidity_hub/pool-manager/schema/pool-manager.json
contracts/liquidity_hub/pool-manager/schema/raw/query.json

Please run just schemas locally and upload the generated schemas.

[kerber0x]

🚢