[WIP] Adjust architecture (ionorg#553)

* Minor fix.

* fix lint errors.

* Refactor business logic.

* Separate business logic and signaling.
  - Support custom business logic node.
  - Add JWT support.

* Remove FindNode from islb.proto.

* Move the jwt directory to signal.

* Move biz(conference server) to /apps.

* Add node id to config.

* golangci-lint fix.

* update.

* Support disconnection detection using service discovery.

* Update.

* Upgrade nats-discovery to v0.3.0.

* Improve directory structure.

* update.

* golangci-lint.

* update.

* update nats-grpc.

Update module github.com/pion/ion-log to v1.0.1 (ionorg#515)

Generated by renovateBot

Co-authored-by: Renovate Bot <bot@renovateapp.com>

chore(deps): update ion-sdk-js to v1.5.3

chore(docker): rename image

ci(workflows): test not ready

Merge branch 'master' into v1.0.0