refactor: update ext protocol registration

[bytemain]

Types

• 🪚 Refactors

Background or solution

我们有两个 ext host: worker 和 node，每次给这俩发消息，同一个内容要序列化两遍，实际上只需要序列化一次发一遍就好。

比如说： #3614 这里面提到的，fireModelOpenedEvent，打开一个 10M 文件，会对这个 10M 文件序列化两遍

要改动的话会非常大，这里先做一下 refactor

Changelog

[railway-app]

This PR is being deployed to Railway 🚅

core: ◻️ REMOVED

[codecov]

Codecov Report

Attention: Patch coverage is 72.39264% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 56.09%. Comparing base (197b8ef) to head (b10bc13).
Report is 1 commits behind head on main.

Files	Patch %	Lines
.../browser/vscode/api/main.thread.api.shared-impl.ts	76.52%	27 Missing ⚠️
...ackages/extension/src/browser/extension.service.ts	62.50%	5 Missing and 1 partial ⚠️
...ion/src/browser/vscode/api/main.thread.api.impl.ts	58.33%	5 Missing ⚠️
...es/extension/src/browser/extension-node.service.ts	42.85%	4 Missing ⚠️
packages/connection/src/common/rpc/multiplexer.ts	0.00%	2 Missing ⚠️
...ension/src/browser/extension-command-management.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3616      +/-   ##
==========================================
+ Coverage   56.05%   56.09%   +0.04%     
==========================================
  Files        1510     1511       +1     
  Lines       91768    91709      -59     
  Branches    18810    18802       -8     
==========================================
+ Hits        51442    51448       +6     
+ Misses      33454    33387      -67     
- Partials     6872     6874       +2     

Flag	Coverage Δ
jsdom	51.51% <72.39%> (+0.03%)	⬆️
node	15.65% <0.00%> (+0.01%)	⬆️

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