Support Oracle Date/Timestamp arrowstream parity with arrow.

[dbascoules]

Resolves Oracle part of #866.

[wangxiaoying]

Hi @dbascoules , thanks for the PR!

Since the goal of this PR largely overlaps with an earlier one #868, it now has some conflicts with the main branch. Also, the code must be formatted to pass the CI, you can do it using cargo fmt.

[dbascoules]

Hi @wangxiaoying,
I just (dumb)rebased the branch on main but not even tried to test/rebuild against my use-cases.
I'll try to do it when having time...

[wangxiaoying]

Please do not change the precision to microsecond for types like NaiveDateTime since not all the databases support it. Instead, you can use the corresponding wrappers with microsecond precision implementation and leave the original types as nanosecond precision.

You can checkout this thread for previous discussions.

[dbascoules]

Before continuing this PR, I suggest that we introduce tests (see #871) to cover all these type conversions and avoid introducing regressions.
I believe this would simplify spec writing and make our communication clearer.
@wangxiaoying what do you think ?