Implement logical assignment operators (&&= and ||=)

[tofpie]

This Pull Request implements logical assignment operators (&&= and ||=).

It changes the following:

• Lexing of &&= and ||=
• Execution of &&= and ||=

[codecov]

Codecov Report

Merging #1018 (a8ef20e) into master (4625c1a) will decrease coverage by 0.04%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##           master    #1018      +/-   ##
==========================================
- Coverage   60.10%   60.05%   -0.05%     
==========================================
  Files         167      167              
  Lines       11142    11156      +14     
==========================================
+ Hits         6697     6700       +3     
- Misses       4445     4456      +11     

Impacted Files	Coverage Δ
boa/src/syntax/ast/op.rs	10.75% <0.00%> (-0.24%)	⬇️
boa/src/syntax/ast/punctuator.rs	5.76% <0.00%> (-0.24%)	⬇️
boa/src/syntax/ast/node/operator/bin_op/mod.rs	66.66% <50.00%> (-1.84%)	⬇️
boa/src/syntax/lexer/operator.rs	70.17% <100.00%> (ø)

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[Razican]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	78,493	78,493	0
Passed	20,882	20,892	+10
Ignored	15,585	15,585	0
Failed	42,026	42,016	-10
Panics	388	388	0
Conformance	26.60	26.62	+0.01%

[Razican]

Looks good, thanks!