Add new connection parameter `tunnelHost` to use with tunnel cunnection.

[Yury-Fridlyand]

Description

Similar to https://github.com/opensearch-project/sql-odbc/pull/42 this PR adds a new connection config parameter tunnelHost to be set when tunnel is used.

TODOs

• [x] Add new parameter
• [x] Trim slash or suffix in the new parameter
• [x] Trim slash or suffix in host parameter
• [x] Make parameter name parsing case-insensitive
• [x] Test on Windows
• [x] Test on Mac
• [x] Update docs

Issues Resolved

N/A

Check List

• [ ] New functionality includes testing.
  • [ ] All tests pass, including unit test, integration test and doctest
• [x] New functionality has been documented.
  • [ ] New functionality has javadoc added
  • [x] New functionality has user manual doc added
• [x] Commits are signed per the DCO using --signoff

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