feat(info): add backdrop to NullLsInfo window

[vuxuanhungg]

What does this PR do?

Adopted from lazy.nvim, several plugins have implemented backdrop for their windows. This PR add a backdrop to NullLsInfo window.

Checklist

• If I'm adding a new builtin (linter, formatter, code action, etc.), I
  understand it should be contributed to
  nvimtools/none-ls-extras.nvim
  instead
• I've written tests for these changes

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❌ Failed to create PR with unit tests: AGENT_CHAT: Failed to open pull request