[🚀 Feature]: [dotnet] [bidi] Support new pattern for extensible types

[nvborisenko]

Description

Example:

CommandResponse = {
  type: "success",
  id: js-uint,
  result: ResultData,
  Extensible
}

https://learn.microsoft.com/en-us/dotnet/api/system.text.json.serialization.jsonextensiondataattribute?view=net-8.0

But it is not easy as seems. Any command and result is extensible! Meaning we should provide API to take this additional data from user. It can be achieved via AnyCommandOptions class which already exists.

Note: It will be hard to choose between IDictionary<string, object> and IDictionary<string, JsonElement>.

Have you considered any alternatives or workarounds?

No response

[titusfortner]

@nvborisenko, thank you for creating this issue. We will troubleshoot it as soon as we can.

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