Revert "[BEAM-12781] Add memoization of BoundedSource encoding for SDFBoundedSourceReader"

[chamikaramj]

Reverts #15357

Potential culprit for https://issues.apache.org/jira/browse/BEAM-12805

[chamikaramj]

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[codecov]

Codecov Report

Merging #15395 (5d5e692) into master (f4e54f2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #15395   +/-   ##
=======================================
  Coverage   83.65%   83.65%           
=======================================
  Files         440      440           
  Lines       59995    59964   -31     
=======================================
- Hits        50187    50162   -25     
+ Misses       9808     9802    -6     

Impacted Files	Coverage Δ
sdks/python/apache_beam/coders/coders.py	87.80% <ø> (-0.19%)	⬇️
...ks/python/apache_beam/coders/coders_test_common.py	98.49% <ø> (-0.02%)	⬇️
sdks/python/apache_beam/io/iobase.py	86.15% <100.00%> (-0.07%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.80% <0.00%> (-0.16%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.64% <0.00%> (+0.24%)	⬆️
...hon/apache_beam/runners/direct/test_stream_impl.py	96.26% <0.00%> (+2.23%)	⬆️

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[chamikaramj]

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[chamikaramj]

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