fix: git context to not exceed spawn sync buffer for very large inFile metadata

[scolladon]

What does this pull request contains

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• Added for new features.
• Changed for changes in existing functionality.
• Deprecated for soon-to-be removed features.
• Removed for now removed features.
• Fixed for any bug fixes.
• Security in case of vulnerabilities.

Explain your changes

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git context is now set to 200 (instead of 10000000000).
It allows very large file to

• not exceed the spawnSync buffer
• keep default spawnSync buffer (1024*1024)
• keep working for every infile metadata kind (200 of context line seems to be enough during the tests)

Does this close any currently open issues?

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closes #47 (again)

• Jest test to check the fix is applied are added.

Any particular element to being able to test locally

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Use yarn test
Use the reproduction playground

Any other comments?

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Can be included in the next release

Where has this been tested?

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Operating System: Darwin Kernel Version 19.6.0: Thu May 6 00:48:39 PDT 2021; root:xnu-6153.141.33~1/RELEASE_X86_64

yarn version: 1.22.10

node version: v14.16.0

git version: 2.32.0

sfdx version: sfdx-cli/7.107.0 darwin-x64 node-v14.16.0

sgd plugin version: 4.61

[codeclimate]

Code Climate has analyzed commit f711912 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #161 (f711912) into master (b8f482c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #161   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files          18       18           
  Lines         414      414           
=======================================
  Hits          411      411           
  Misses          3        3           

Impacted Files	Coverage Δ
src/utils/fileGitDiff.js	100.00% <100.00%> (ø)

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