Improve correctness check for RowType columns

[kvaturka]

Improve correctness check of row types by applying specific validation to individual fields

Part of #13809

== RELEASE NOTES ==

Verifier Changes
* Add specific validation checks for the individual fields when validating a row column.

[kvaturka]

Please take a closer look on validation output format.
It might be to verbose and hard to read.
I believe it needs to be improved.

[mbasmanova]

@kvaturka Would you squash commits?

[caithagoras]

Apologize for the delay. I'll get it reviewed by tomorrow morning.

[caithagoras]

This is how our error message looks like in a column mismatch case. The mismatched column section has one column at a time. In a row column case, can we do the same in terms of 1 field per line? That would be more readable.

COLUMN MISMATCH
Control 36100 rows, Test 36100 rows
Mismatched Columns:
  agg__1 (bigint): control(checksum: b3 ef 0b 4d 5e 18 65 7c) test(checksum: f4 d3 7e 8f 17 29 6b c6)
  gbc__0 (bigint): control(checksum: 48 d5 1f ca be de ea b6) test(checksum: 4c 82 62 cc 7b e1 66 01)
  gbc__1 (varchar): control(checksum: ca 44 f8 14 fd 29 da db) test(checksum: 04 d8 4a 5a 33 21 ff 46)

To achieve that, you may want to change ColumnMatchResult.message to List<String> messages.

[caithagoras]

Commit title is too long and thus is cut off. (max 72 characters).
You can simply say Improve correctness check for RowType columns.

[kvaturka]

I have changed mismatch output for RowType.
Each field mismatch will be on new line.
r row(i int, biging):

COLUMN MISMATCH
Control 36100 rows, Test 36100 rows
Mismatched Columns:
  r$i (int): control(checksum: b3 ef 0b 4d 5e 18 65 7c) test(checksum: f4 d3 7e 8f 17 29 6b c6)
  r$$col_2 (bigint): control(checksum: 48 d5 1f ca be de ea b6) test(checksum: 4c 82 62 cc 7b e1 66 01)

[caithagoras]

lgtm % nit
Travis failures are related, please take a look.

[caithagoras]

Thank you for contributing!

[mbasmanova]

@kvaturka Thank you for the contribution.