Enable casting from Date64 to Timestamp

[gruuya]

Which issue does this PR close?

Closes #3037

Rationale for this change

I'm working on adding support for remote tables in Seafowl (in analogy with PG FDWs) using the connector-x crate. An issue that comes up is the fact that connector-x uses arrow's Date64 as the target type for coercion of various datetime/timestamp types from other DBs.

More specifically, Postgres TIMESTAMP is converted into Date64. On the other hand, Datafusion interprets TIMESTAMP type as arrow's Timestamp(TimeUnit::Nanosecond, None). Consequently, I end up needing to cast from Date64 (as returned by connector-x) into Timestamp (as expected by Datafusion), but such cast is not supported at the moment.

What changes are included in this PR?

I expanded the cast kernel to facilitate the Date64 -> Timestamp cast, as well as the can_cast_types function to reflect this.

Are there any user-facing changes?

Trying to cast from Date64 to Timestamp will not error out after this; not sure whether this warrants a doc change somewhere.

[tustvold]

Thank you

[ursabot]

Benchmark runs are scheduled for baseline = 4df1cc4 and contender = 951caed. 951caed is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java