chore: add total LP share amount to the Pair query response

[kerber0x]

Description and Motivation

Adds the total LP share amount to the Pair query response, as this was a missing piece of information lost when we removed the Pool query.

Related Issues

Closes #344

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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 96.96970% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.89%. Comparing base (deebeee) to head (3d6ccfa). Report is 1 commits behind head on release/v2_contracts.

Files	Patch %	Lines
...ty_hub/pool-manager/src/tests/integration_tests.rs	96.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/v2_contracts #347 +/- ## ======================================================== + Coverage 89.86% 89.89% +0.02% ======================================================== Files 261 261 Lines 27339 27342 +3 ======================================================== + Hits 24569 24579 +10 + Misses 2770 2763 -7 ```

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[0xFable]

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