[feature](function) Support iot_first/last function

[morningman]

Proposed changes

Related to PR #7459.

Implement iot_first and iot_last functions.
These are two aggregate functions that are used to implement semantics similar to the
first and last functions in influxdb.

Examples can be found in iot_first.md and iot_last.md

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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• Code refactor (Modify the code structure, format the code, etc...)
• Optimization. Including functional usability improvements and performance improvements.
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Checklist

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• I have created an issue on (Fix #ISSUE) and described the bug/feature there in detail
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Further comments

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[yangzhg]

better to extract code like below into a function

    if (ts.is_null || val.is_null) {
        return;
    }

    if (dst->is_null) {
        // first update
        _init_iot_first_last_state(context, ts, val, dst);
    } else {
        auto* dst_data = reinterpret_cast<IoTFirstLastState*>(dst->ptr);
        if (val.val > dst_data->val.val) {
            dst_data->ts = ts;
            dst_data->val = val; 
        }
    }

[github-actions]

We're closing this PR because it hasn't been updated in a while.
This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and feel free a maintainer to remove the Stale tag!