Initializer parameter naming

[ArcadeMode]

jsObject was technically correct but didnt convey much intent to the user, this was especially apparent after including it in constructor comments. New name is initializer to convey what it does.

Added some e2e tests for different parameterized constructors too

[github-actions]

Test Results

    9 files     73 suites   36s ⏱️
  695 tests   691 ✅  4 💤 0 ❌
1 986 runs  1 961 ✅ 25 💤 0 ❌

Results for commit f12e210.

♻️ This comment has been updated with latest results.

[github-actions]

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 7763 2.63GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.103
  [Host]     : .NET 10.0.3 (10.0.3, 10.0.326.7603), X64 RyuJIT x86-64-v3
  Job-MLTFGY : .NET 10.0.3 (10.0.3, 10.0.326.7603), X64 RyuJIT x86-64-v3

InvocationCount=1  IterationCount=1  LaunchCount=10  
RunStrategy=ColdStart  UnrollFactor=1  WarmupCount=0  

Method	Compilation	ClassCount	Mean	Error	StdDev	Min	Max
Generate	AOT	0	14.91 ms	0.712 ms	0.471 ms	14.32 ms	16.03 ms
Generate	AOT	1	32.92 ms	1.187 ms	0.785 ms	31.02 ms	33.99 ms
Generate	AOT	10	32.30 ms	1.309 ms	0.866 ms	31.42 ms	34.44 ms
Generate	AOT	25	44.77 ms	0.964 ms	0.637 ms	43.70 ms	45.60 ms
Generate	AOT	50	57.25 ms	2.440 ms	1.614 ms	54.84 ms	59.47 ms
Generate	AOT	100	92.73 ms	3.650 ms	2.414 ms	89.46 ms	96.00 ms
Generate	AOT	200	95.85 ms	1.695 ms	1.121 ms	94.33 ms	98.25 ms
Generate	JIT	0	43.66 ms	0.524 ms	0.347 ms	43.27 ms	44.16 ms
Generate	JIT	1	822.08 ms	14.874 ms	9.838 ms	808.15 ms	837.55 ms
Generate	JIT	10	824.45 ms	16.683 ms	11.035 ms	810.80 ms	844.65 ms
Generate	JIT	25	864.39 ms	15.041 ms	9.949 ms	847.66 ms	881.58 ms
Generate	JIT	50	890.22 ms	13.942 ms	9.221 ms	878.02 ms	905.39 ms
Generate	JIT	100	990.07 ms	13.565 ms	8.972 ms	978.11 ms	1,007.38 ms
Generate	JIT	200	977.50 ms	17.032 ms	11.266 ms	959.29 ms	991.38 ms