Add soft debugger support to s390x (#35781)

Add soft debugger support to s390x (#35781)

* Add soft debugger support to s390x
  - Implement the sdb trampoline
  - Big-endian fixes for ppdb debugger:
    - Fix utf16 strings
    - Fix decoding of ImageDebugDirectory structures
  - New implementation of OP_SEQ_POINT
  - Enable successful unwind by defining markpoints
  - Implement mono_arch_setup_resume_sighandler_ctx
  - Implement unwind ops in epilog

* Fix delegate-invoke processing
  - Handle up to 10 parameters
  - Use sigparam information to correctly "slide" parameters

* Fix floating point negative zero for s390x
  - Add a new instruction for use in OP_RxCONST -0
  - Check for -0 in constant

* Minor indentation fixes

* Fix atomic add implementation

* Check for additional hardware facilities