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

---

Checklist:

• I have read Migaloo's contribution guidelines.
• 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.
• The code is formatted properly cargo fmt --all --.
• Clippy doesn't report any issues cargo clippy -- -D warnings.
• I have regenerated the schemas if needed cargo schema.

[codecov]

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 ⚠️

Additional details and impacted files

@@                   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     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[0xFable]

LGTM

[0xFable]

🚀