Change Symbol hash to u64

[HalidOdat]

It changes the following:

• Change symbol hash from u32 to u64, This is done because it is possible to overflow the u32 hash since its only 4 bilion, but a u64 is 18_446_744_073_709_551_616 even if we crated a symbol every 1ns it would take 584 years (so... pretty much will never overflow)

[github-actions]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	78,415	78,415	0
Passed	18,461	18,461	0
Ignored	15,547	15,547	0
Failed	44,407	44,407	0
Panics	1,129	1,129	0
Conformance	23.54	23.54	0.00%

[codecov]

Codecov Report

Merging #911 into master will not change coverage.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           master     #911   +/-   ##
=======================================
  Coverage   59.19%   59.19%           
=======================================
  Files         166      166           
  Lines       10512    10512           
=======================================
  Hits         6223     6223           
  Misses       4289     4289           

Impacted Files	Coverage Δ
boa/src/builtins/symbol/mod.rs	77.27% <66.66%> (ø)
boa/src/context.rs	61.64% <100.00%> (ø)

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[github-actions]

Benchmark for fd692ac

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
Arithmetic operations (Execution)	376.8±13.30ns	428.2±12.58ns	-12.00%
Arithmetic operations (Full)	289.8±35.12µs	280.3±15.70µs	+3.39%
Array access (Execution)	8.8±0.53µs	8.9±0.54µs	-1.12%
Array access (Full)	316.4±16.49µs	313.3±64.22µs	+0.99%
Array creation (Execution)	3.0±0.14ms	2.9±0.13ms	+3.45%
Array creation (Full)	3.3±0.23ms	3.1±0.11ms	+6.45%
Array pop (Execution)	1084.4±50.94µs	1087.4±44.71µs	-0.28%
Array pop (Full)	1684.4±83.42µs	1532.6±124.00µs	+9.90%
Boolean Object Access (Execution)	5.0±0.26µs	5.2±0.17µs	-3.85%
Boolean Object Access (Full)	314.1±27.46µs	285.4±13.31µs	+10.06%
Clean js (Execution)	800.6±35.12µs	773.3±22.20µs	+3.53%
Clean js (Full)	1121.7±47.00µs	1083.4±59.95µs	+3.54%
Clean js (Parser)	42.0±2.32µs	42.7±2.13µs	-1.64%
Create Realm	508.0±23.18ns	502.5±25.00ns	+1.09%
Dynamic Object Property Access (Execution)	6.6±0.50µs	6.4±0.20µs	+3.12%
Dynamic Object Property Access (Full)	306.3±13.04µs	291.6±9.30µs	+5.04%
Expression (Parser)	7.6±0.32µs	7.4±0.27µs	+2.70%
Fibonacci (Execution)	994.6±66.14µs	979.8±40.09µs	+1.51%
Fibonacci (Full)	1424.5±105.51µs	1325.2±41.92µs	+7.49%
For loop (Execution)	25.6±0.85µs	24.7±1.00µs	+3.64%
For loop (Full)	321.1±12.67µs	324.8±18.87µs	-1.14%
For loop (Parser)	21.0±0.95µs	20.4±1.09µs	+2.94%
Goal Symbols (Parser)	14.1±0.59µs	13.1±0.54µs	+7.63%
Hello World (Parser)	3.8±0.24µs	3.7±0.17µs	+2.70%
Long file (Parser)	888.8±44.37ns	852.9±26.66ns	+4.21%
Mini js (Execution)	703.2±24.40µs	690.7±24.58µs	+1.81%
Mini js (Full)	1032.0±43.03µs	996.2±39.89µs	+3.59%
Mini js (Parser)	36.6±1.32µs	35.6±2.06µs	+2.81%
Number Object Access (Execution)	4.1±0.28µs	4.0±0.09µs	+2.50%
Number Object Access (Full)	291.1±13.02µs	289.0±13.19µs	+0.73%
Object Creation (Execution)	5.7±0.33µs	5.6±0.75µs	+1.79%
Object Creation (Full)	313.3±22.45µs	288.6±23.91µs	+8.56%
RegExp (Execution)	13.6±1.39µs	11.3±0.53µs	+20.35%
RegExp (Full)	324.6±18.63µs	291.9±15.06µs	+11.20%
RegExp Literal (Execution)	12.7±0.65µs	11.4±0.51µs	+11.40%
RegExp Literal (Full)	322.0±20.84µs	295.4±10.72µs	+9.00%
RegExp Literal Creation (Execution)	11.7±1.14µs	10.9±0.47µs	+7.34%
RegExp Literal Creation (Full)	305.0±27.80µs	295.8±53.18µs	+3.11%
Static Object Property Access (Execution)	6.1±0.36µs	5.7±0.31µs	+7.02%
Static Object Property Access (Full)	300.2±16.62µs	283.9±9.24µs	+5.74%
String Object Access (Execution)	8.2±0.50µs	8.1±0.24µs	+1.23%
String Object Access (Full)	301.3±11.29µs	298.8±12.83µs	+0.84%
String comparison (Execution)	7.4±0.28µs	7.2±0.42µs	+2.78%
String comparison (Full)	308.3±20.44µs	293.9±12.14µs	+4.90%
String concatenation (Execution)	6.1±0.40µs	5.9±0.23µs	+3.39%
String concatenation (Full)	306.8±24.86µs	286.9±17.40µs	+6.94%
String copy (Execution)	5.0±0.27µs	4.5±0.23µs	+11.11%
String copy (Full)	283.4±17.36µs	285.2±14.96µs	-0.63%
Symbols (Execution)	4.3±0.21µs	4.2±0.23µs	+2.38%
Symbols (Full)	282.6±12.97µs	278.7±11.63µs	+1.40%