Add the feature "dmpstore -l" and "dmpstore -s".

Add the feature "dmpstore -l" and "dmpstore -s".
The file format is as below:
<File> := <Variable>+
<Variable> := <Name-Size> <Data-Size> <Name> <GUID> <Attributes> <Data> <Crc32>

Each variable representation in the file has a CRC32 value which can provide a mechanism to detect the file modification.
When any CRC32 is incorrect, dmpstore rejects to load the variables from the file.

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15083 6f19259b-4bc3-4df7-8a09-765794883524