[Rust] Implement TO_TIMESTAMP function

[asfimport]

Implement the TO_TIMESTAMP function, as described in https://docs.google.com/document/d/18O9YPRyJ3u7-58J02NtNVYb6TDWBzi3mIQC58VhwxUk/edit

Reporter: Andrew Lamb / @alamb
Assignee: Andrew Lamb / @alamb

Related issues:

• [Rust][DataFusion] to_timestamp function parses timestamp without timezone offset as UTC rather than local (is related to)

PRs and other links:

• GitHub Pull Request #8142

_{Note: This issue was originally created as ARROW-9944. Please see the migration documentation for further details.}

[asfimport]

Andy Grove / @andygrove:
Issue resolved by pull request 8142
#8142