feat(log-query): implement the first part of log query expr

[waynexia]

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?

Including aggr, filter, scalar fn, and qualifier. See test cases for detail

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (4)

src/query/src/log_query/planner.rs:252

• [nitpick] The error message for UnknownAggregateFunction could be more descriptive. Consider including additional context or suggestions for resolution.

name: fn_name.to_string(),

src/query/src/log_query/planner.rs:287

• [nitpick] The error message for UnknownScalarFunction could be more descriptive. Consider including additional context or suggestions for resolution.

name: name.to_string(),

src/query/src/log_query/planner.rs:264

• The group_exprs variable is not being used in the return statement of build_aggr_func. It should be included in the return value.

Ok((aggr_expr, group_exprs))

src/query/src/log_query/planner.rs:271

• The log_expr_to_df_expr method does not handle non-string literals correctly. Ensure that literals of other types are handled appropriately.

LogExpr::Literal(literal) => Ok(lit(ScalarValue::Utf8(Some(literal.clone())))),

[fengjiachun]

LGTM