Add hash API to manage persistent data

Added APIs
- bta_gattc_hash_load
- bta_gattc_hash_write
- bta_gattc_cache_link

Modified API
- bta_gattc_cache_write

Bug: 154056389
Test: build
Tag: #feature
Change-Id: I60d0b82be278ec514c4aa929f24b7c663cf0f4a2