New function ValueFrom that takes a Go value and populates a compatible attr.Value, given a descriptive attr.Type

[megan07]

fixes #323

[detro]

Testing this locally now

[bendbennett]

Is it worth testing other types (e.g., types.Map), along the lines of

	Address types.Map    `tfsdk:"address"`

Then using the following in personAttrTypes:

		"address": types.MapType{
			ElemType: types.StringType,
		},

Populating mrX with:

		Address: types.Map{
			ElemType: types.StringType,
			Elems: map[string]attr.Value{
				"number": types.String{Value: "1"},
				"street": types.String{Value: "Beckford Close"},
				"town":   types.String{Value: "Gotham"},
			},
		},

And finally testing expectedMrXObj:

			"address": types.Map{
				ElemType: types.StringType,
				Elems: map[string]attr.Value{
					"number": types.String{Value: "1"},
					"street": types.String{Value: "Beckford Close"},
					"town":   types.String{Value: "Gotham"},
				},
			},

[detro]

Just added it ;)

[bendbennett]

Nice. Just a minor comment.

[github-actions]

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