patch 9.2.0815: deeply nested regexp patterns may cause stack overflow

patch 9.2.0815: deeply nested regexp patterns may cause stack overflow

Problem:  Deeply nested regexp groups can cause uncontrolled recursion
          in the regexp compiler and exhaust the C stack.
Solution: Limit recursive regexp parsing depth in both the backtracking
          and NFA compilers (lipengyu)

closes: #20731

Signed-off-by: lipengyu <lipengyu@kylinos.cn>
Signed-off-by: Christian Brabandt <cb@256bit.org>