Add parse buffer abstraction to clean-up code

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.76923% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 80.82%. Comparing base (3ea4ddb) to head (e8f3f84).

Files	Patch %	Lines
crates/wasmi/src/module/read.rs	0.00%	3 Missing :warning:
crates/wasmi/src/module/parser.rs	91.30%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1033 +/- ## ========================================== - Coverage 80.83% 80.82% -0.01% ========================================== Files 269 269 Lines 24817 24825 +8 ========================================== + Hits 20060 20065 +5 - Misses 4757 4760 +3 ```

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