DynamicTablesPkg: Definition for DynamicPlatRepoLib interface

DynamicTablesPkg: Definition for DynamicPlatRepoLib interface

The DynamicPlatRepoLib library allows to handle dynamically created
CmObj. The dynamic platform repository can be in the following states:
1 - Non-initialised
2 - Transient:
    Possibility to add CmObj to the platform, but not to query them.
3 - Finalised:
    Possibility to query CmObj, but not to add new.

A token is allocated to each CmObj added to the dynamic platform
repository (except for reference tokens CmObj). This allows to
retrieve dynamic CmObjs among all CmObj (static CmObj for instance).

This patch defines the library interface of the DynamicPlatRepo.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>