tests: use a generator for sharded pubsub topics
set pubsub topic in encoder/decoder based on sharding type
add function for grouping content topics by pubsub topic
add autosharding config to create options
add autoshard rpc endpoints to nwaku and use in tests
set autoshard pubsub topics in all protocols
fix rebase with static sharding
removes unused function
remove console logs
remove autosharding from ShardInfo, add to EncoderOptions
fix enr and encoder/decoder options
test that same application/version hashes to same shard index
update comment on shard field
fix spelling of autosharding
fix content topic protocol in tests
add sharding type alias and function to determine topic in encoders/decoders
move DefaultPubsubTopic from core to interfaces
* add proto
* add rpc and interfaces
* add protocol implementation
* update faulty proto def
* add rpc and interfaces
* refactor implementation & write test
* setup the metadata protocol as a service
* fix cases where metadata service needs to be undefined
* remove redundant catch block
* remove addressed TODO
* update import path
* log errors
* remove redundant code from handling incoming metadata request
* update tests
* add test to check for active connections
* change expects
* save remote peer's shard info after successful connection
