refactor(query): Remove PhysicalOptimizer trait

[leaf-potato]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

as title, part of https://github.com/GreptimeTeam/greptimedb/issues/3884

What's changed and what's your intention?

Remove PhysicalOptimizer trait and move optimize_physical_plan method into DatafusionQueryEngine.

Checklist

• [x] I have written the necessary rustdoc comments.
• [x] I have added the necessary unit tests and integration tests.
• [ ] This PR requires documentation updates.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.76%. Comparing base (49f22f0) to head (6a396df). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4413 +/- ## ========================================== - Coverage 85.04% 84.76% -0.29% ========================================== Files 1075 1075 Lines 192553 192579 +26 ========================================== - Hits 163754 163230 -524 - Misses 28799 29349 +550 ```

[evenyag]

There are some conflicts.

You can merge https://github.com/GreptimeTeam/greptimedb/pull/4414 to this PR to avoid further conflicts between these two PRs.

[leaf-potato]

There are some conflicts.

You can merge #4414 to this PR to avoid further conflicts between these two PRs.

new PR #4426