feat: handle URL path prefix in InfluxDB

[NguyenHoangSon96]

Closes #172

Proposed Changes

• Support URL with a path prefix, currently we only support the root URL.
• Some test cases with timeout will now use ConstantFlightServerDelayed class for consistent results.
• Add a test case for "write_port_overwrite" because Codecov complains.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.96%. Comparing base (c35f372) to head (3fd9f01).

Additional details and impacted files

@@ Coverage Diff @@ ## main #173 +/- ## ========================================== + Coverage 69.79% 69.96% +0.16%  ========================================== Files 35 35 Lines 2314 2317 +3 ========================================== + Hits 1615 1621 +6  + Misses 699 696 -3 

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[vlastahajek]

path should be added also for query API

[NguyenHoangSon96]

path should be added also for query API

I read that gRPC can't have a path prefix but I will check again.