What problem does this PR solve?

Timestamp types that support precision and time zones, as well as conversion of related types, are implemented. Added precision support for the time type. current_timestamp function added.

What is changed and how it works?

Code changes

• Has Rust code change
• Has CI related scripts change

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Note for reviewer