[v3] Download special char issue

[jace-roell]

What It Does
This PR resolves an issue where special characters could become corrupted when downloading large files. The corruption was caused by each chunk buffer being converted to a string when calling the processNewLines() function and then converted back to a buffer. This PR introduces support for passing buffers directly into the processNewLines() function to prevent corruption.

How to Test
The issue arises when a special character appears as the last character of a stream chunk. To reproduce, create a PDS file containing exclusively special characters with a size larger than the default chunk size (>8KB). In such cases, the last character of each chunk may be corrupted and appear as two unknown characters.

To observe this issue, download a PDS file that meets the criteria using the following example command (assuming the use of IBM-1147 encoding):

zowe zos-file download ds <PDSMEMBER> --encoding "IBM-1147"

where <PDSMEMBER> is a file larger than 8KB containing special characters.

Example Line (about 105 are required in a file to exceed 8KB):
àèéìòùÀÈÉÌÒÙ°àèéìòùÀÈÉÌÒÙ°àèéìòùÀÈÉÌÒÙ°àèéìòùÀÈÉÌÒÙ°àèéìòùÀÈÉÌÒÙ°àèéìòùÀÈÉÌÒÙ°à

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.27%. Comparing base (33b8d94) to head (e5f82b9).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2366   +/-   ##
=======================================
  Coverage   91.27%   91.27%           
=======================================
  Files         636      636           
  Lines       18071    18083   +12     
  Branches     3895     3862   -33     
=======================================
+ Hits        16495    16506   +11     
- Misses       1575     1576    +1     
  Partials        1        1           

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[traeok]

I tested with the example string in the PR description and was able to reproduce the same output without any data loss.

Thanks Jace for the fix! LGTM

[gejohnston]

Once a question on the V2 PR is resolved and applied in this PR if needed, then this PR looks good to me.

[zFernand0]

LGTM! 😋

[github-actions]

Release succeeded for the master branch. 🎉

The following packages have been published:

• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]
• npm: @zowe/[email protected]

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