Refactor engine's ValueStack API

[Robbepop]

• This somewhat improves the whacky ValueStack API of Wasmi's executor engine. It introduces extend_by and refactors alloc_call_frame and removes plenty of APIs that are no longer needed due to these changes.
• The gist of this PR is that it (hopefully) needs a bit less unsafe code or that the unsafe code is isolated a bit better.
• Another hope with this PR is that performance stays the same or at best improves, especially for call-intense workloads. However, performance improvements have not been detected locally unfortunately.

In Summary

• Adds ValueStack::extend_by method
• Removes ValueStack::{reserve, extend_slice, extend_zeros, fill_at, stack_ptr_last_n} methods
• Adds FrameParams type abstraction
• Refactors all code that is touched by the above items

[codecov]

Codecov Report

Attention: Patch coverage is 79.51807% with 17 lines in your changes missing coverage. Please review.

Project coverage is 80.68%. Comparing base (3c42a09) to head (c7f06fb).

Files	Patch %	Lines
crates/wasmi/src/engine/executor/instrs/call.rs	73.33%	8 Missing ⚠️
crates/wasmi/src/engine/executor/stack/values.rs	85.36%	6 Missing ⚠️
crates/wasmi/src/engine/executor/mod.rs	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1059      +/-   ##
==========================================
- Coverage   80.73%   80.68%   -0.05%     
==========================================
  Files         268      268              
  Lines       25028    25009      -19     
==========================================
- Hits        20206    20179      -27     
- Misses       4822     4830       +8     

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