sp-api: Move macro related re-exports to __private (#2446)

This moves the macro related re-exports to `__private` to make it more
obvious for downstream users that they are using an internal api.

---------

Co-authored-by: command-bot <>

Cargo.lock

@@ -1493,8 +1493,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "93f2635620bf0b9d4576eb7bb9a38a55df78bd1205d26fa994b25911a69f212f"
 dependencies = [
  "bitcoin_hashes",
- "rand 0.7.3",
- "rand_core 0.5.1",
+ "rand 0.8.5",
+ "rand_core 0.6.4",
  "serde",
  "unicode-normalization",
 ]
@@ -4237,6 +4237,7 @@ dependencies = [
  "sp-runtime",
  "sp-state-machine",
  "sp-storage 13.0.0",
+ "sp-version",
  "thiserror",
  "tokio",
  "tokio-util",
@@ -10423,6 +10424,7 @@ dependencies = [
  "pallet-nfts",
  "parity-scale-codec",
  "sp-api",
+ "sp-std 8.0.0",
 ]
 
 [[package]]
@@ -16124,6 +16126,7 @@ dependencies = [
  "sp-blockchain",
  "sp-consensus",
  "sp-core",
+ "sp-externalities 0.19.0",
  "sp-maybe-compressed-blob",
  "sp-rpc",
  "sp-runtime",
@@ -16357,6 +16360,7 @@ dependencies = [
  "lazy_static",
  "libc",
  "log",
+ "parity-scale-codec",
  "parking_lot 0.12.1",
  "regex",
  "rustc-hash",
@@ -20011,7 +20015,7 @@ checksum = "97fee6b57c6a41524a810daee9286c02d7752c4253064d0b05472833a438f675"
 dependencies = [
  "cfg-if",
  "digest 0.10.7",
- "rand 0.7.3",
+ "rand 0.8.5",
  "static_assertions",
 ]