Conditional_non_pii_keys behavior is not consistent with original LIKE behavior

[justjkk]

tipoca-stream/redshiftsink/pkg/transformer/masker/mask_config.go

Lines 379 to 383 in ec29410

	// replace sql patterns with regex patterns
	// TODO: cover all cases :pray
	pattern = strings.ReplaceAll(pattern, "%", ".*")
	pattern = "^" + pattern + "$"
	regex, ok := m.regexes[pattern]

The above logic is not consistent with the LIKE functionality since:

1. _ in LIKE should be interpreted as . in regex. (Ref: SQL LIKE)
2. ., ?, etc.. in LIKE should be treated as literal and should not have special meaning.
3. LIKE query in MySQL can be case sensitive when run on a column that uses case insensitive collation(eg: utf8_general_ci).

[justjkk]

Checked the existing definitions and found that there is pretty much no impact. However, we should look into deprecating the % syntax in favor of regex based ones.