fix: remove to_timezone function

[killme2008]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

First, the to_timezone function doesn't make sense, because GreptimeDB timestamp types don't contain the timezone info, they are always in the UTC timezone. The timezone only affects the conversation between timestamps and strings, and we already take care of it.

Second, the current implementation of to_timezone is incorrect, it's return type is always strings:

greptimedb/src/common/function/src/scalars/timestamp/to_timezone.rs

Line 150 in b81d3a2

(Some(time), _) => Some(time.to_timezone_aware_string(tz.as_ref())),

But the return_type depends on the first input type:

greptimedb/src/common/function/src/scalars/timestamp/to_timezone.rs

Line 64 in b81d3a2

Ok(input_types[0].clone())

So let's remove it at all.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.74%. Comparing base (b81d3a2) to head (301b027).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4439      +/-   ##
==========================================
- Coverage   85.03%   84.74%   -0.30%     
==========================================
  Files        1075     1074       -1     
  Lines      192560   192330     -230     
==========================================
- Hits       163750   162991     -759     
- Misses      28810    29339     +529