[Feature] Support Selecting Properties in `jsonInputArg` objects.

Summary of the new feature / enhancement

Provide a method of passing individual properties as arguments instead of the entire JSON.

This supports more complex scenarios, and splitting behavior already exists when using "input": "env".

Reasoning

In creating a Pip resource I found myself wishing I could pass in just the "name" property as an argument. While the resource would not be as feature rich, combined with #1261 and #1264 I could have created a resource using only the definition and without needing a separate program.

I see a pattern of configuration / package management programs which:

• Could be resources.
• Accept strings as arguments, but not JSON.
• Can output their current state as JSON.

Proposed technical implementation details (optional)

Simple Option

• Support a property selector allowing for parts of a JSON object to be used as command arguments.
• Remove the "jsonInputArg" property, as the JSON is always a separate argument as is.

{
        "set": {
            "executable": "python.exe",
            "args": [
                "-m",
                "pip",
                "--no-input",
                "install",
                {
                    "mandatory": true,
                    "property": "name"
                }
            ]
        }
}

More Complex Option

Implement Simple option, and support optional arguments based on a JSON property.

{
        "set": {
            "executable": "python.exe",
            "args": [
                "-m",
                "pip",
                "--no-input",
                "install",
                {
                    "mandatory": false,
                    "property": "useLatest",
                    "type": "switch",
                     args: [ "--upgrade" ]  // Only added if "useLatest" is true.
                },
                {
                    "mandatory": true,
                    "property": "name"
                }
            ]
        }
}

{
    "set": {
        "executable": "python.exe",
        "args": [
            "-m",
            "pip",
            "--no-input",
            "install",
            {
               "if": {
                "properties": {
                  "useLatest": { "const": true }
                }
              },
              "then": {
                "args": [
                    "--upgrade"
                ]
              }
            },
            {
               "if": {
                "properties": {
                  "version": { "type": "string" }
                },
                {
                  "required": [ "version" ]
                }
              },
              "then": {
                "args": [
                    { "format": "{name}=={version}" }
                ]
              },
              "else": {
                "args": [
                    { "format": "{name}" }
                ]
              }
            }
        ]
    }
}
</details>

Start by locating the existing jsonInputArg handling and the argument processing for set.args. Determine whether the intended scope is the simple property selector or also the optional and conditional forms; done means individual JSON properties can be passed as command arguments according to the selected scope.