feat(fuzz): add alter table target

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#3174

What's changed and what's your intention?

add alter table target

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

[codecov]

Codecov Report

Attention: Patch coverage is 78.46890% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 84.92%. Comparing base (b55905c) to head (eab40ad).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3503      +/-   ##
==========================================
- Coverage   85.32%   84.92%   -0.40%     
==========================================
  Files         904      904              
  Lines      149972   150172     +200     
==========================================
- Hits       127962   127537     -425     
- Misses      22010    22635     +625     

[fengjiachun]

LGTM

[tisonkun]

@WenyXu why do you think this impl is suboptimal? It literally implement the semantic and since total columns should be in a small set I think it's good to do:

fn position<P>(&mut self, mut predicate: P) -> Option<usize> where ...
{
                let n = len!(self);
                let mut i = 0;
                while let Some(x) = self.next() {
                    if predicate(x) {
                        return Some(i);
                    }
                    i += 1;
                }
                None
}