Add non-streaming Wasm module creation

[Robbepop]

So far Wasmi only supported streaming parsing, validation and compilation of Wasm modules via Module::new.

This PR renames both Module::new and Module::new_unchecked to new_streaming and new_streaming_unchecked respectively. Also it adds 2 new methods Module::new and Module::new_unchecked that take a wasm: &[u8] byte slice argument instead of a stream: impl Read argument. The idea behind this change is that if streaming compilation is not necessary we can optimize the process.

Benchmarks

The benchmarks locally show amazing performance wins across the board.
For lazy and especially lazy-unchecked compilation I consistently saw improvements between 40-80% (5x speed-up).

[codecov]

Codecov Report

Attention: Patch coverage is 81.86275% with 37 lines in your changes are missing coverage. Please review.

Project coverage is 80.86%. Comparing base (3880d86) to head (4c66abc).
Report is 1 commits behind head on master.

Files	Patch %	Lines
crates/wasmi/src/module/parser/streaming.rs	84.15%	16 Missing ⚠️
crates/wasmi/src/module/parser/buffered.rs	82.43%	13 Missing ⚠️
crates/wasmi/src/module/mod.rs	40.00%	6 Missing ⚠️
crates/cli/src/context.rs	0.00%	1 Missing ⚠️
crates/wasmi/src/module/parser.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1035      +/-   ##
==========================================
+ Coverage   80.82%   80.86%   +0.03%     
==========================================
  Files         269      271       +2     
  Lines       24825    24896      +71     
==========================================
+ Hits        20065    20132      +67     
- Misses       4760     4764       +4     

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