chore(hash-stream-node): move fileStreamHasher to own file

[trivikr]

Issue

Preparing for adding hasher for non-file streams

Description

Moves fileStreamHasher to own file.

Testing

CI

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[codecov-commenter]

Codecov Report

Merging #3086 (9d0a95c) into main (b0e1422) will decrease coverage by 0.00%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main    #3086      +/-   ##
==========================================
- Coverage   58.72%   58.72%   -0.01%     
==========================================
  Files         571      571              
  Lines       30622    30620       -2     
  Branches     7541     7541              
==========================================
- Hits        17984    17982       -2     
  Misses      12638    12638              

Impacted Files	Coverage Δ
packages/hash-stream-node/src/HashCalculator.ts	90.00% <ø> (ø)
packages/hash-stream-node/src/fileStreamHasher.ts	88.88% <88.88%> (ø)

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[AllanZhengYP]

Approved. One thing to notice here is that the current file stream hasher returns the hash before the request payload is even start to be sent. However, for a real stream hasher, the hash can only be returned util all the payload stream has been sent. So you cannot use it in the request header. We need to find ways to notify this difference.

[github-actions]

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