media_index.c: Refactored so it doesn't cache the index

Testing revealed that the cache added no benefit but that it could
consume excessive memory.

Two new index related functions were created:
ast_sounds_get_index_for_file() and ast_media_index_update_for_file()
which restrict index updating to specific sound files.

The original ast_sounds_get_index() and ast_media_index_update()
calls are still available but since they no longer cache the results
internally, developers should re-use an index they may already have
instead of calling ast_sounds_get_index() repeatedly.  If information
for only a single file is needed, ast_sounds_get_index_for_file()
should be called instead of ast_sounds_get_index().

The media_index directory scan code was elimininated in favor of
using the existing ast_file_read_dirs() function.

Since there's no more cache, ast_sounds_index_init now only
registers the sounds cli commands instead of generating the
initial index and subscribing to stasis format register/unregister
messages.

"sounds" is no longer a valid target for the "module reload"
command.

Both the sounds cli commands and the sounds ari resources were
refactored to only call ast_sounds_get_index() once per invocation
and to use ast_sounds_get_index_for_file() when a specific sound
file is requested.

Change-Id: I1cef327ba1b0648d85d218b70ce469ad07f4aa8d

include/asterisk/sounds_index.h

@@ -40,6 +40,19 @@ struct ast_media_index;
  */
 struct ast_media_index *ast_sounds_get_index(void);
 
+/*!
+ * \brief Get the index for a specific sound file
+ * \since 13.25.0
+ * \since 16.2.0
+ *
+ * \param filename Sound file name without extension
+ *
+ * \retval sounds index (must be ao2_cleanup()'ed)
+ * \retval NULL on failure
+ */
+struct ast_media_index *ast_sounds_get_index_for_file(const char *filename);
+
+
 #if defined(__cplusplus) || defined(c_plusplus)
 }
 #endif