BaseTools: efi_debugging.py: Add debugger agnostic dbg Python Classes

BaseTools: efi_debugging.py: Add debugger agnostic dbg Python Classes

Add Scripts/efi_debugging.py to provide debugger agnostic debugging
utility Python classes.

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Signed-off-by: Rebecca Cran <quic_rcran@quicinc.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>