Add support for parameterized constructors in System.Text.Json contract customization (converters)

[eiriktsarpalis]

Taken from #63686 (comment):

The internal converters for collection and dictionary types do provide similar functionality, and we might consider exposing dedicated constructor delegates for each kind:

• A Func<IList, object>>? CreateEnumerable delegate for JsonTypeInfoKind.Enumerable
• A Func<IDictionary, object>>? CreateDictionary delegate for JsonTypeInfoKind.Dictionary.
• A Func<object[], object>? CreateObjectWithParameters delegate for invoking parameterized constructors in JsonTypeInfoKind.Object.

Note that these would require exposing the JsonTypeInfo.ElementType and JsonTypeInfo.KeyType properties, respectively. The parameterized constructor delegate would require exposing the internal [JsonParameterInfo]
#78098 metadata type.

Related bugs that should be addressed in conjunction with this story:

• System.Text.Json contract customization ignoring custom CreateObject delegates in certain collection types #73382
• System.Text.Json does not support constructors with byref parameters. #46088
• Expose information about JsonPropertyInfo being readable/writable #77307
• S.T.J.JsonSerializer doesn't support properties marked with JsonRequiredAttribute that're initialized through ctor #78098
• [JsonSerializer] Relax restrictions on ctor param type to immutable property type matching where reasonable #44428
• JsonSerializer.Serialize an anonymous type, with duplicate nested names throws an unexpected exception #81550

[ghost]

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Issue Details

---

Taken from #63686 (comment):

The internal converters for collection and dictionary types do provide similar functionality, and we might consider exposing dedicated constructor delegates for each kind:

• A Func<IList, object>>? CreateEnumerable delegate for JsonTypeInfoKind.Enumerable
• A Func<IDictionary, object>>? CreateDictionary delegate for JsonTypeInfoKind.Dictionary.
• A Func<object[], object>? CreateObjectWithParameters delegate for invoking parameterized constructors in JsonTypeInfoKind.Object.

Note that these would require exposing the JsonTypeInfo.ElementType and JsonTypeInfo.KeyType properties, respectively. The parameterized constructor delegate would require exposing the internal JsonParameterInfo metadata type.

Author:	eiriktsarpalis
Assignees:	-
Labels:	area-System.Text.Json
Milestone:	-