Refactor ctor and implicit conversions as template-based

[kzu]

This simplifies mantainability down the road.

This also allowed conditional generation of the primary constructor if users already provide one with the required Value parameter. A pair of codefixes are provided to either remove a non-compliant ctor entirely or renaming the parameter to Value as required.

[devlooped-bot]

🧪 Details on Microsoft Windows 10.0.20348

✅ StructId.ComparableGeneratorTests.GenerateComparable
✅ StructId.ComparableGeneratorTests.GenerateStringParseable
✅ StructId.ConstructorGeneratorTests.GenerateRecordConstructor
✅ StructId.ConstructorGeneratorTests.GenerateRecordConstructorInGlobalNamespace
✅ StructId.ConstructorGeneratorTests.GenerateRecordStringConstructor
✅ StructId.Functional.FunctionalTests.Dapper
✅ StructId.Functional.FunctionalTests.EntityFramework
✅ StructId.Functional.FunctionalTests.EqualityTest
✅ StructId.Functional.FunctionalTests.ImplicitAndExplicitCast
✅ StructId.Functional.FunctionalTests.Newtonsoft
✅ StructId.NewtonsoftJsonGeneratorTests.DoesNotGenerateIfNewtonsoftJsonNotPresent
✅ StructId.NewtonsoftJsonGeneratorTests.GenerateIfNewtonsoftJsonPresent
✅ StructId.ParsableGeneratorTests.GenerateParseable
✅ StructId.ParsableGeneratorTests.GenerateStringParseable
✅ StructId.ParsableGeneratorTests.NoParseableAvailable
✅ StructId.RecordAnalyzerTests.ClassNotStructId
✅ StructId.RecordAnalyzerTests.PartialRecordStructNotReadonly
✅ StructId.RecordAnalyzerTests.PartialStringRecordStructNotReadonly
✅ StructId.RecordAnalyzerTests.ReadonlyRecordStructNoStructId
✅ StructId.RecordAnalyzerTests.ReadonlyRecordStructNotPartial
✅ StructId.RecordAnalyzerTests.ReadonlyRecordStructWithNonValueConstructor
✅ StructId.RecordAnalyzerTests.ReadonlyStringRecordStructNotPartial
✅ StructId.RecordAnalyzerTests.RecordStructNoStructId
✅ StructId.RecordAnalyzerTests.RecordStructNotReadonlyNorPartial
✅ StructId.RecordAnalyzerTests.StructNotStructId
✅ StructId.RecordCodeFixTests.AddPartialKeyword
✅ StructId.RecordCodeFixTests.AddReadOnlyModifier
✅ StructId.RecordCodeFixTests.ChangeRecordStruct
✅ StructId.RecordCtorCodeFixTests.RemoveCtor
✅ StructId.RecordCtorCodeFixTests.RenameValue

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