BaseTools: Enhance Bin Cache database to support save the cache

BaseTools: Enhance Bin Cache database to support save the cache

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1726

V2: Added the platform name to the path
Add more level sub-directories in the database to support save
the cache for multiple platforms with multiple tool-chains and
targets, just like edk2 Build output.

Signed-off-by: Christian Rodriguez <christian.rodriguez@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>