Support multiple roles for banyand

[hanahmily]

Banyand has been updated to run in multiple roles, but it cannot work in cluster mode. There are still several pending tasks to be completed.

As a reviewer, you should focus on the document that outlines the fundamental behavior of the server with multiple roles in Banyand.

• Update the CHANGES log.

[codecov-commenter]

Codecov Report

Merging #305 (595c6a0) into main (c001e15) will decrease coverage by 0.09%.
The diff coverage is 4.00%.

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
- Coverage   39.93%   39.84%   -0.09%     
==========================================
  Files         100      101       +1     
  Lines       10870    10894      +24     
==========================================
  Hits         4341     4341              
- Misses       6111     6135      +24     
  Partials      418      418              

Impacted Files	Coverage Δ
banyand/liaison/grpc/property.go	0.00% <ø> (ø)
banyand/liaison/grpc/registry.go	20.13% <ø> (ø)
banyand/metadata/client.go	0.00% <0.00%> (ø)
pkg/run/run.go	0.00% <0.00%> (ø)
banyand/liaison/grpc/server.go	68.47% <100.00%> (ø)

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[hanahmily]

@lujiajing1126 I've already separated the embed server from the schema registry. Could you update your local repo in case there are some conflicts?

[wu-sheng]

So, with this spliting, banyandb still is able to run in stand alone mode? But as support to set an external etcd cluster?

[hanahmily]

So, with this spliting, banyandb still is able to run in stand alone mode? But as support to set an external etcd cluster?

It has the capacity to run as a standalone with embed etcd without external ones.

[wu-sheng]

I mean, do we expect am external etcd in cluster? Or still running internally?