Inheritance relationship adjustment.

[ymh199478]

Q	A
Branch?	v2.0(master)
Bug fix?	No
New feature?	No
Deprecations?	No
Internal Changed?	Yes
Removed	No
Tests pass?	Yes
Doc pr?	No

This commit adjusts the inheritance relationship of Stream object

[codecov-io]

Codecov Report

Merging #247 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #247   +/-   ##
=======================================
  Coverage   97.23%   97.23%           
=======================================
  Files          36       36           
  Lines        2457     2457           
=======================================
  Hits         2389     2389           
  Misses         68       68

Impacted Files	Coverage Δ
src/CatLib.Core/Support/Stream/PipelineStream.cs	76.31% <ø> (ø)	⬆️
src/CatLib.Core/Support/Stream/CombineStream.cs	97.4% <ø> (ø)	⬆️

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