H-3976: Replace Buffer in favour of MutableBuffer

[indietyp]

🌟 What is the purpose of this PR?

Right now the Buffer is immutable in the sense that we make use of SubscriptionRef for atomic effects, should a buffer be used across forks/fibers. This has quite the overhead, especially for something so central, instead the Effect code should be replaced with Either code.

Profiling has shown that this is a 400-600% speedup, primarily because we no longer synchronize the index and have therefore a lot lower of an overhead.

in Rust terms this basically moved this from async to sync code.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

[codecov]

Codecov Report

Attention: Patch coverage is 79.05138% with 53 lines in your changes missing coverage. Please review.

Project coverage is 21.39%. Comparing base (72a325f) to head (a38a6d9).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
...arpc/client/typescript/src/binary/MutableBuffer.ts	92.85%	4 Missing and 3 partials ⚠️
...pt/src/wire-protocol/models/request/RequestBody.ts	45.45%	6 Missing ⚠️
...ript/src/wire-protocol/models/response/Response.ts	33.33%	6 Missing ⚠️
...local/harpc/client/typescript/src/types/Version.ts	62.50%	3 Missing ⚠️
...ent/typescript/src/wire-protocol/models/Payload.ts	80.00%	2 Missing and 1 partial ⚠️
.../src/wire-protocol/models/response/ResponseBody.ts	72.72%	3 Missing ⚠️
...ocal/harpc/client/typescript/src/net/Connection.ts	0.00%	2 Missing ⚠️
...t/src/wire-protocol/models/request/RequestBegin.ts	60.00%	2 Missing ⚠️
...t/src/wire-protocol/models/request/RequestFlags.ts	60.00%	2 Missing ⚠️
...t/src/wire-protocol/models/request/RequestFrame.ts	60.00%	2 Missing ⚠️
... and 16 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6277      +/-   ##
==========================================
+ Coverage   21.21%   21.39%   +0.17%     
==========================================
  Files         573      573              
  Lines       19658    19682      +24     
  Branches     2870     2884      +14     
==========================================
+ Hits         4171     4210      +39     
+ Misses      15435    15415      -20     
- Partials       52       57       +5     

Flag	Coverage Δ
apps.hash-ai-worker-ts	1.39% <ø> (ø)
apps.hash-api	1.14% <ø> (ø)
local.harpc-client	50.49% <79.05%> (+1.79%)	⬆️
local.hash-backend-utils	8.81% <ø> (ø)
local.hash-graph-sdk	58.62% <ø> (ø)
local.hash-isomorphic-utils	0.91% <ø> (ø)
local.hash-subgraph	24.54% <ø> (ø)

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