Allow updating config of pool-manager

[kaimen-sano]

Description and Motivation

• Allows an UpdateConfig msg to be sent to the pool-manager contract to update the contract configuration.
• Implements a QueryMsg::Config on the pool-manager contract

Related Issues

closes #294, related to #309.

Before merging this PR, we need to have a think about how we want to handle contract ownership. We currently have the cosmwasm contract admin, the cw-ownable owner, and the Config.owner.

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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 95.28302% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 89.42%. Comparing base (64ec60f) to head (c63be19). Report is 10 commits behind head on release/v2_contracts.

:exclamation: Current head c63be19 differs from pull request most recent head 1412749. Consider uploading reports for the commit 1412749 to get more accurate results

Files	Patch %	Lines
...acts/liquidity_hub/pool-manager/src/tests/suite.rs	80.00%	3 Missing :warning:
...ty_hub/pool-manager/src/tests/integration_tests.rs	97.14%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/v2_contracts #328 +/- ## ===================================================== Coverage 89.42% 89.42% ===================================================== Files 260 261 +1 Lines 26656 26704 +48 ===================================================== + Hits 23836 23879 +43 - Misses 2820 2825 +5 ```

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