MdeModulePkg/CapsuleLib: Add ProcessCapsules() API.
MdeModulePkg/CapsuleLib: Add ProcessCapsules() API.

ProcessCapsules() API can be used by platform BDS to process all capsules.

Cc: Feng Tian <e66bb7e9f36c82a029035c5885acf75500d07e68@intel.com>
Cc: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Cc: Michael D Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Chao Zhang <fed49a7a524fbe970930fd44cd2de5a9d4952d81@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Reviewed-by: Michael Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Tested-by: Michael Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>

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