dialect/sql: escape special characters in pattern matching

[a8m]

Resources:

• https://www.postgresql.org/docs/current/functions-matching.html\#FUNCTIONS-LIKE
• https://www.sqlite.org/lang_expr.html\#the_like_glob_regexp_and_match_operators
• https://dev.mysql.com/doc/refman/8.0/en/string-literals.html

Fixed #2059

[a8m]

Another approach is to store indexes of special characters, and then loop over the indexes, use copy and inject escape characters between them. Something as follows:

b := make([]byte, 0, len(w) + len(idx))
for _, idx := range idxs {
	b = append(b, w[:idx]...)
	w = [idx+1:]
	b = append(b, '//')
}
b = append(b, w...)

Need to check what is faster.