Nfts attribute read interface (#13349)

* feat: add custom and system attributes to Inspect

* feat: add nfts runtime api

* fix: pass std feature to runtime api

* fix: api copyright

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

---------

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

substrate/frame/nfts/runtime-api/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "pallet-nfts-runtime-api"
+version = "4.0.0-dev"
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2021"
+license = "Apache-2.0"
+homepage = "https://substrate.io"
+repository = "https://github.com/paritytech/substrate/"
+description = "Runtime API for the FRAME NFTs pallet."
+readme = "README.md"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+codec = { package = "parity-scale-codec", version = "3.2.2", default-features = false, features = ["derive"] }
+frame-support = { version = "4.0.0-dev", default-features = false, path = "../../support" }
+pallet-nfts = { version = "4.0.0-dev", default-features = false, path = "../../nfts" }
+sp-api = { version = "4.0.0-dev", default-features = false, path = "../../../primitives/api" }
+
+[features]
+default = ["std"]
+std = [
+	"codec/std",
+    "frame-support/std",
+	"pallet-nfts/std",
+	"sp-api/std",
+]