Fix Clippy erorrs

[AnnikaCodes]

This PR changes the following:

• Fixes Clippy errors (based on cargo clippy -Z unstable-options --fix)
  • if we want to turn off the range.contains() thing that's okay too
• Ignores the unnecessary_wraps Clippy lint; it looks like we want all NativeFunctions to return a Result, which entails "unnecessary" wrapping. turns out this is just a Nightly Rust thing

[codecov]

Codecov Report

Merging #1015 (05f6002) into master (23bc476) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1015      +/-   ##
==========================================
+ Coverage   59.79%   59.82%   +0.03%     
==========================================
  Files         167      167              
  Lines       11087    11085       -2     
==========================================
+ Hits         6629     6632       +3     
+ Misses       4458     4453       -5     

Impacted Files	Coverage Δ
boa/src/builtins/bigint/mod.rs	71.64% <100.00%> (+1.49%)	⬆️
boa/src/builtins/date/mod.rs	67.87% <100.00%> (ø)
boa/src/builtins/number/mod.rs	63.11% <100.00%> (ø)
boa/src/object/mod.rs	51.97% <100.00%> (+0.56%)	⬆️
boa/src/syntax/lexer/cursor.rs	68.96% <100.00%> (+0.67%)	⬆️
boa/src/syntax/lexer/mod.rs	66.66% <100.00%> (ø)

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