chore(vrl): Add Kind::remove

[fuchsnj]

closes #13460
makes progress on #7070

This replaces the Kind::remove_at_path with a new Kind::remove.

• The previous implementation used the old lookup code, which has been migrated in the new implementation.
• Previously many deletions were not supported, such as coalescing, negative indexing, or compaction. All possible removals are now fully supported.

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[pablosichert]

First round of pedantic suggestions 😄

[pablosichert]

The remove logic is quite involved, I didn't try to understand every nuance of it. That being said, there was nothing that stood out as particularly odd to me. +1 for the extensive set of tests to cover this area.

[JeanMertz]

This looks great! Thanks for doing this.