feat(connectors): add Meilisearch source connector

[countradooku]

Summary

• add the Meilisearch source connector using the official meilisearch-sdk
• document source configuration, retry behavior, and primary-key cursor requirements
• add Docker-backed integration coverage for producing indexed Meilisearch documents into Iggy

Motivation

This splits the source portion out of #3404 so the Meilisearch source can be reviewed and merged independently from the sink connector.

Closes #3496.

Validation

• cargo sort --no-format --workspace
• cargo test -p iggy_connector_meilisearch_source
• cargo clippy -p iggy_connector_meilisearch_source --all-targets -- -D warnings
• env CARGO_BIN_EXE_iggy-server=... CARGO_BIN_EXE_iggy-connectors=... cargo test -p integration --test mod -- connectors::meilisearch::meilisearch_source
• git diff --check

[codecov]

Codecov Report

❌ Patch coverage is 78.58407% with 121 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.39%. Comparing base (4a48008) to head (d7d4405).

Files with missing lines	Patch %	Lines
...e/connectors/sources/meilisearch_source/src/lib.rs	78.58%	96 Missing and 25 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3498       +/-   ##
=============================================
- Coverage     74.27%   45.39%   -28.88%     
  Complexity      937      937               
=============================================
  Files          1259     1257        -2     
  Lines        125969   110479    -15490     
  Branches     101644    86198    -15446     
=============================================
- Hits          93558    50156    -43402     
- Misses        29396    57600    +28204     
+ Partials       3015     2723      -292     

Components	Coverage Δ
Rust Core	37.88% <78.58%> (-37.28%)	⬇️
Java SDK	58.57% <ø> (ø)
C# SDK	71.43% <ø> (-0.68%)	⬇️
Python SDK	88.88% <ø> (ø)
PHP SDK	84.29% <ø> (ø)
Node SDK	91.35% <ø> (+0.12%)	⬆️
Go SDK	40.36% <ø> (ø)

Files with missing lines	Coverage Δ
...e/connectors/sources/meilisearch_source/src/lib.rs	78.58% <78.58%> (ø)

... and 374 files with indirect coverage changes

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[ryerraguntla]

overall correct direction - cursor-by-primary-key is the right shape for Meilisearch, test coverage is present but coverage gap — only happy-path covered. No test for: (a) state restored across restart → cursor starts from last_primary_key, not from zero; (b) second poll produces zero duplicates. refer The elasticsearch_source.rs has state_persists_across_connector_restart as a pattern. For a cursor-based source, duplicate-freedom is the core invariant; it should be integration-tested.

[ryerraguntla]

/author

[countradooku]

/ready

[ryerraguntla]

@countradooku - Looks very good. There are no blockers/criticals , only warnings and nits. After this fix, it should be good. @hubcio - After these are taken care, could one of the committers review and merge

[ryerraguntla]

/author

[countradooku]

/ready

[ryerraguntla]

/author