fix: Compute murmur3 hash with dictionary input correctly

[advancedxy]

Which issue does this PR close?

Closes #427

Rationale for this change

Bug fixes. When submitting #424, we found there's a bug in spark_hash, which doesn't handle dictionary array correctly. This PR tries to fix this first.

What changes are included in this PR?

1. refactor some part of spark_hash.rs and be ready for xxhash64 support
2. unpack dictionary when computing with hashes
3. updated test

This PR currently depends on #426, will rebase once that's merged.

How are these changes tested?

Updated test with randomized input.

[advancedxy]

@viirya @kazuyukitanimura @sunchao PTAL when you have time.

[advancedxy]

Gently ping @viirya @sunchao and @andygrove