Change-Id: If99e3b4fc2d7e86fc3e61182aa6c835b407ed49e

ASTERISK_REGISTER_FILE no longer has any purpose so this commit removes
all traces of it.

Previously exported symbols removed:
* __ast_register_file
* __ast_unregister_file
* ast_complete_source_filename

This also removes the mtx_prof static variable that was declared when
MTX_PROFILE was enabled.  This variable was only used in lock.c so it
is now initialized in that file only.

ASTERISK-26480 #close

Change-Id: I1074af07d71f9e159c48ef36631aa432c86f9966

This patch adds a new API to the Asterisk core that acts as a media
cache. The core API itself is mostly a thin wrapper around some bucket
API provided implementation that itself acts as the mechanism of
retrieval for media. The media cache API in the core provides the
following:
 * A very thin in-memory cache of the active bucket_file items. Unlike a
   more traditional cache, it provides no expiration mechanisms. Most
   queries that hit the in-memory cache will also call into the bucket
   implementations as well. The bucket implementations are responsible
   for determining whether or not the active record is active and valid.
   This makes sense for the most likely implementation of a media cache
   backend, i.e., HTTP. The HTTP layer itself is the actual arbiter of
   whether or not a record is truly active; as such, the in-memory cache
   in the core has to defer to it.
 * The ability to create new items in the media cache from local
   resources. This allows for re-creation of items in the cache on
   restart.
 * Synchronization of items in the media cache to the AstDB. This
   also includes various pieces of important metadata.

The API provides sufficient access that higher level APIs, such as the
file or app APIs, do not have to worry about the semantics of the bucket
APIs when needing to playback a resource.

In addition, this patch provides unit tests for the media cache API. The
unit tests use a fake bucket backend to verify correctness.

Change-Id: I11227abbf14d8929eeb140ddd101dd5c3820391e