feat(rpc): add protocol for ext document service

[bytemain]

Types

• 🎉 New Features

Background or solution

当我们打开一个文件的时候，会向插件进程发送一个 fireModelOpenedEvent 事件，这个事件包含了 model 的全文，如果我们使用 json 序列化的话，数据会膨胀的非常大。

过去：

9.5m -> 12.5m

10.5m -> 62.9m

现在：

9.5m -> 9.6m

10.5m -> 10.5m

Changelog

[railway-app]

This PR is being deployed to Railway 🚅

core: ◻️ REMOVED

[bytemain]

这个 62.9m 的例子可以用这个文件来复现：

dd if=/dev/zero of=10m.txt bs=10m count=1

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 56.07%. Comparing base (b5df89c) to head (5ae9ee4).
Report is 1 commits behind head on main.

Files	Patch %	Lines
packages/connection/src/common/rpc/multiplexer.ts	92.30%	1 Missing ⚠️
packages/extension/src/hosted/ext.process-base.ts	0.00%	1 Missing ⚠️
packages/extension/src/hosted/worker.host.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3614      +/-   ##
==========================================
+ Coverage   56.05%   56.07%   +0.01%     
==========================================
  Files        1510     1512       +2     
  Lines       91707    91794      +87     
  Branches    18795    18813      +18     
==========================================
+ Hits        51407    51471      +64     
- Misses      33433    33451      +18     
- Partials     6867     6872       +5     

Flag	Coverage Δ
jsdom	51.49% <90.00%> (+0.01%)	⬆️
node	15.65% <46.66%> (+0.02%)	⬆️

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