MdeModulePkg/DumpDynPcd: Add application to dump dynamic PCD settings

MdeModulePkg/DumpDynPcd: Add application to dump dynamic PCD settings

This is a shell application to dump dynamic PCD settings.
Type DumpDynPcd -?/h/H to get help information.
Type DumpDynPcd -v/V to get version information.
Type DumpDynPcd [PcdName] to get Pcd information.
https://bugzilla.tianocore.org/show_bug.cgi?id=1541

v2:1.Add static for global variables.
   2.Change the parameter amount of InternalStrnCatGrow in DumpDynPcd.c.
   3.Add open brace according to EDK II C Coding Standards Specification.
   4.Remove the dependency on ShellPkg.dec in DumpDynPcd.inf.

v3:Add static for all global variables and internal functions.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>