- add API endpoint for listing tags from store
- rename 'swarm-tag-uid' header to 'swarm-tag'
- rename field 'stored' to 'processed'
- estimate total number of chunks during upload

* add pss websocket api for opening a persistent connection for incoming messages on a given topic
* add pss message send api to send outgoing messages

Add ens resolver client and integrate resolver into the api package

manifest, jsonmanifest, api, node: remove parser from jsonmanifest and replace with binary marshalling

Add functionality to serve directory content

- add 'pkg/manifest'
- update 'pkg/api'

* Tag for chunks

* storage: add validating mock storage
* api: add bzzchunk api