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Hubert Plociniczak dd06c59380
Initialize Language Server's JSON RPC protocol asynchronously (#7232) 
As discovered in #7224, Json RPC protocol was added to the asynchronous resource initialization stage, as part of #6306, but was not in fact initialized at that point.
Instead it was initialized when the server was started to be able to serve correctly the initialization messages. A classic Catch-22. It was really hard to discover this just by looking at the code, but the profiling clearly showed where the time was spent.

This change splits Language Server's protocol into two:
- the first one accepts `heartbeat/init` and `session/initProtocolConnection`
- the second one enriches it with the full set of supported messages

This shifts the initialization from blocking for 0.5 sec to only ~30ms, and performing the second stage asynchronously.

Closes #7224.

# Important Notes
Before the change (blocking server startup):
![Screenshot from 2023-07-05 18-53-24](https://github.com/enso-org/enso/assets/292128/bcfa9043-d00a-4b36-a44c-782a388a16b9)
![Screenshot from 2023-07-05 18-53-10](https://github.com/enso-org/enso/assets/292128/54927787-4c95-46db-bd68-f3a3b82367d5)

After the change (1st stage):
![Screenshot from 2023-07-06 14-02-34](https://github.com/enso-org/enso/assets/292128/d7a7bc34-39dc-46f1-9e64-6d350697c30b)

After the change (2nd, asynchronous initialization, stage):
![Screenshot from 2023-07-06 14-21-17](https://github.com/enso-org/enso/assets/292128/def8c0a1-f211-4fc0-9df0-7c1634312166)
2023-07-07 11:49:23 +00:00
..
src/main Initialize Language Server's JSON RPC protocol asynchronously (#7232) 2023-07-07 11:49:23 +00:00
README.md Add a markdown style guide (#1022) 2020-07-21 13:59:40 +01:00

README.md

JSON-RPC Server Test

Tests for the JSON-RPC Server.