Add Vertica driver to the list of community drivers

[sitingren]

Add Vertica driver to the list of community drivers.

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Thank you for your contribution! Before submitting this PR, please make sure:

• [x] Your code builds clean without any errors or warnings
• [x] You have made the needed changes to the docs
• [x] You have written a description of what is the purpose of this pull request above

[gjsjohnmurray]

Please also add it to the doc page table in https://github.com/RandomFractals/vscode-sqltools/blob/dev/docs/src/pages/en/drivers/drivers-table.mdx