feat(stdlib): Add new object_from_array function

[bruceg]

Summary

Adds a new object_from_array function as discussed in #1157

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

How did you test this PR?

Unit tests are included

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on
  our guidelines.
• No. A maintainer will apply the "no-changelog" label to this PR.

Checklist

• Our CONTRIBUTING.md is a good starting place.
• If this PR introduces changes to LICENSE-3rdparty.csv, please
  run dd-rust-license-tool write and commit the changes. More details here.
• For new VRL functions, please also create a sibling PR in Vector to document the new function.

[bruceg]

Note that I plan a follow-up PR to add support for an optional keys parameter to avoid the need for zip and to add support for null keys. If you think that doing an implicit to_string on every key is reasonable, I would be open to that too, but that might be a little surprising.

Also, I don't really like the name object_from_array and would love a better suggestion. If you think from_array actually makes more sense, I can do that too.

[bruceg]

This is a straight-up clone of the construct in zip. Where would it make sense to move it into common code?

[pront]

Yes, we can introduce a src/stdlib/utils.rs (for the lack of a better name)

[pront]

Thanks!