Add Apache License to additional files

[alamb]

Part of

• Release sqlparser-rs version 0.52.0 #1423

While working on release scripts in #1479 the RAT check flagged several more files that didn't have a ASF header (I missed some in #1437)

I pulled them out into their own PR to make it easier to review

[coveralls]

Pull Request Test Coverage Report for Build 11711824168

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 89.391%

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Totals
Change from base Build 11708484234:	0.0%
Covered Lines:	30587
Relevant Lines:	34217

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💛 - Coveralls

[alamb]

fyi @iffyio

[alamb]

Thank you @andygrove