don't regenerate the checksum

[TingDaoK]

Issue #, if available:

• We previously clean up the checksum after prepare.
• It results in the checksum to be recalculated during retry
• It's violating the durability guarantee
• However, since we already buffer the input in memory during retry, it won't read the customer input again, which mitigated the impact.

Description of changes:

• Revamp the code a bit to allow the passed in checksum to the input stream wrappers. So that it won't recalculate the checksum

TODO:

• The whole checksum logic is already complicated this makes it more weird, need to revamp it...
• I'd prefer to push the revamp of the checksum logic later when we implement the full object checksum.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.36364% with 13 lines in your changes missing coverage. Please review.

Project coverage is 89.52%. Comparing base (1762f83) to head (1ae6022).

Files with missing lines	Patch %	Lines
source/s3_chunk_stream.c	73.52%	9 Missing ⚠️
source/s3_request_messages.c	76.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
- Coverage   89.57%   89.52%   -0.05%     
==========================================
  Files          21       21              
  Lines        6541     6561      +20     
==========================================
+ Hits         5859     5874      +15     
- Misses        682      687       +5     

Files with missing lines	Coverage Δ
source/s3_auto_ranged_put.c	92.39% <100.00%> (+0.03%)	⬆️
source/s3_request_messages.c	74.00% <76.47%> (-0.37%)	⬇️
source/s3_chunk_stream.c	77.35% <73.52%> (+0.48%)	⬆️

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[TingDaoK]

Included in #532