Add optional extra-checks to Wasmi executor and make checking more consistent

[Robbepop]

This PR

• adds a new crate feature: extra-checks
• improves asserts and their messages for builds with debug-assertions or extra-checks enabled.
• removes certain Wasmi executor checks that rely on Wasmi translation invariants if debug-assertions and extra-checks are disabled.
• benchmarks conducted locally show a maximum performance penalty for enabled checks of up to 20%. However, it depends on the exact workload.

New crate feature: extra-checks

# Enables extra checks performed during Wasmi bytecode execution.
#
# These checks are unnecessary as long as Wasmi translation works as intended.
# If Wasmi translation invariants are broken due to bugs, these checks prevent
# Wasmi execution to exhibit undefined behavior (UB) in certain cases.
#
# Expected execution overhead is upt to 20%, if enabled.
#
# - Enable if your focus is on safety.
# - Disable if your focus is on execution speed.
extra-checks = []

[codecov]

Codecov Report

Attention: Patch coverage is 5.55556% with 34 lines in your changes missing coverage. Please review.

Project coverage is 81.27%. Comparing base (55b18f1) to head (7a094d8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/wasmi/src/engine/executor/instrs/branch.rs	18.18%	9 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/call.rs	0.00%	5 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/copy.rs	0.00%	4 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/store.rs	0.00%	4 Missing ⚠️
crates/wasmi/src/engine/executor/instrs.rs	0.00%	2 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/memory.rs	0.00%	2 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/return_.rs	0.00%	2 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/select.rs	0.00%	2 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/table.rs	0.00%	2 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/load.rs	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1217      +/-   ##
==========================================
- Coverage   81.38%   81.27%   -0.11%     
==========================================
  Files         303      303              
  Lines       24973    25006      +33     
==========================================
  Hits        20324    20324              
- Misses       4649     4682      +33     

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