Make String.prototype.repeat() ECMAScript specification compliant

[HalidOdat]

It changes the following:

• Make String.prototype.repeat() ECMAScript specification compliant
• Made repeat use Interpreters to_string
• Added a string limit as V8 and spidermonkey does (2 ^ 32 - 1).
• Added tests.

[codecov]

Codecov Report

Merging #582 into master will increase coverage by 0.12%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master     #582      +/-   ##
==========================================
+ Coverage   70.69%   70.81%   +0.12%     
==========================================
  Files         177      177              
  Lines       11290    11322      +32     
==========================================
+ Hits         7981     8018      +37     
+ Misses       3309     3304       -5     

Impacted Files	Coverage Δ
boa/src/builtins/string/mod.rs	38.39% <84.61%> (+1.28%)	⬆️
boa/src/builtins/string/tests.rs	100.00% <100.00%> (ø)
boa/src/exec/exception.rs	64.00% <0.00%> (+8.00%)	⬆️
boa/src/builtins/error/range.rs	76.19% <0.00%> (+19.04%)	⬆️

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[github-actions]

Benchmark for a10b8e7

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
Arithmetic operations (Execution)	374.1±8.83ns	376.7±11.43ns	-0.69%
Arithmetic operations (Full)	170.6±13.71µs	166.1±2.77µs	+2.71%
Array access (Execution)	14.2±0.34µs	14.2±0.28µs	0.00%
Array access (Full)	189.2±4.22µs	189.8±3.35µs	-0.32%
Array creation (Execution)	3.9±0.05ms	3.9±0.10ms	0.00%
Array creation (Full)	4.2±0.04ms	4.2±0.06ms	0.00%
Array pop (Execution)	1529.4±22.91µs	1506.4±62.38µs	+1.53%
Array pop (Full)	1889.3±57.63µs	1868.2±58.98µs	+1.13%
Boolean Object Access (Execution)	4.2±0.10µs	4.2±0.11µs	0.00%
Boolean Object Access (Full)	178.1±3.71µs	176.7±5.57µs	+0.79%
Create Realm	156.6±2.96µs	157.1±5.53µs	-0.32%
Dynamic Object Property Access (Execution)	6.6±0.11µs	6.7±0.11µs	-1.49%
Dynamic Object Property Access (Full)	182.6±7.58µs	179.5±5.01µs	+1.73%
Expression (Lexer)	2.4±0.08µs	2.4±0.04µs	0.00%
Expression (Parser)	5.5±0.08µs	5.5±0.10µs	0.00%
Fibonacci (Execution)	985.2±28.03µs	998.8±43.61µs	-1.36%
Fibonacci (Full)	1206.4±50.19µs	1234.1±93.75µs	-2.24%
For loop (Execution)	22.9±0.96µs	22.8±0.44µs	+0.44%
For loop (Full)	196.2±4.11µs	198.8±8.48µs	-1.31%
For loop (Lexer)	5.3±0.10µs	5.3±0.14µs	0.00%
For loop (Parser)	14.3±0.25µs	14.3±0.23µs	0.00%
Goal Symbols (Parser)	8.7±0.31µs	8.6±0.19µs	+1.16%
Hello World (Lexer)	831.2±25.74ns	829.9±22.43ns	+0.16%
Hello World (Parser)	2.2±0.10µs	2.2±0.03µs	0.00%
Long file (Parser)	6.4±0.08ms	6.3±0.05ms	+1.59%
Number Object Access (Execution)	3.3±0.05µs	3.4±0.07µs	-2.94%
Number Object Access (Full)	174.2±3.50µs	178.1±2.97µs	-2.19%
Object Creation (Execution)	5.7±0.14µs	5.7±0.17µs	0.00%
Object Creation (Full)	198.0±3.14µs	198.7±3.67µs	-0.35%
RegExp (Execution)	67.3±1.55µs	68.7±3.11µs	-2.04%
RegExp (Full)	259.9±8.35µs	256.0±7.40µs	+1.52%
RegExp Literal (Execution)	71.5±2.25µs	72.3±2.16µs	-1.11%
RegExp Literal (Full)	257.3±4.53µs	254.3±8.74µs	+1.18%
RegExp Literal Creation (Execution)	68.3±1.86µs	68.4±1.75µs	-0.15%
RegExp Literal Creation (Full)	300.9±11.15µs	299.0±7.00µs	+0.64%
Static Object Property Access (Execution)	5.8±0.19µs	5.8±0.08µs	0.00%
Static Object Property Access (Full)	177.1±3.82µs	177.7±4.82µs	-0.34%
String Object Access (Execution)	8.1±0.21µs	8.3±0.33µs	-2.41%
String Object Access (Full)	183.0±4.53µs	182.3±10.45µs	+0.38%
String comparison (Execution)	6.5±0.10µs	6.6±0.26µs	-1.52%
String comparison (Full)	181.5±6.73µs	181.7±10.96µs	-0.11%
String concatenation (Execution)	5.5±0.13µs	5.5±0.11µs	0.00%
String concatenation (Full)	177.4±5.02µs	175.4±3.46µs	+1.14%
String copy (Execution)	4.2±0.06µs	4.3±0.07µs	-2.33%
String copy (Full)	174.3±3.62µs	174.7±5.26µs	-0.23%
Symbols (Execution)	3.7±0.13µs	3.7±0.11µs	0.00%
Symbols (Full)	165.4±3.54µs	166.8±3.33µs	-0.84%