chore(parser): use datavalues::IntervalType instead of DateTimeField

[andylokandy]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

• remove DateTimeField and use datavalues::IntervalType instead

Changelog

• Improvement

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Name	Status	Preview	Updated
databend	✅ Ready (Inspect)	Visit Preview	May 14, 2022 at 11:31AM (UTC)

[mergify]

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[BohuTANG]

CI faliure:

test parser::test_statements_in_legacy_suites ... ok

failures:

---- parser::test_expr stdout ----

Goldenfile diff for "expr.txt":
To regenerate the goldenfile, run
    env REGENERATE_GOLDENFILES=1 cargo test
------------------------------------------------------------
---------- Input ----------
a
---------- Output ---------
a
---------- AST ------------
ColumnRef {
    span: [
        Ident(0..1),
    ],
    database: None,
    table: None,
    column: Identifier {
        name: "a",
        quote: None,
        span: Ident(0..1),
    },
}

https://github.com/datafuselabs/databend/runs/6433887445?check_suite_focus=true#step:3:300