[regression-test](load) add something like $.tag.[a.b] key's json case

[felixwluo]

Proposed changes

1、json

{
        "tags": {
                "a.b": "test",
                "k2": "k2_value"
        }
}

add a regression test to parse a key like a.b

Further comments

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[doris-robot]

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[felixwluo]

run buildall

[github-actions[bot]]

PR approved by at least one committer and no changes requested.

[github-actions[bot]]

PR approved by anyone and no changes requested.

[felixwluo]

run p0