Add payment_queryFeeDetails RPC (#7692)

* Return FeeDetails in compute_fee_raw()

* Add payment_queryDetails rpc

* Simplify serde attribute a bit

* Fix line width check

* Use saturating_add()

* Move transaction payment rpc types to types.rs

* Add file header

* Fix test

* Update Cargo.lock

* Nit

* Apply the review suggestions

* .

* .

* Fix serde

* Fix rust doc

* .

* Update frame/transaction-payment/src/types.rs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

* Use NumberOrHex in fee details RPC

* Address review feedback

* Nits

* Update some docs

* Address review

* Update frame/transaction-payment/src/types.rs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

* Happy 2021

* Nit

* Address code review

* Remove needless bound

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

substrate/Cargo.lock

@@ -5119,9 +5119,9 @@ dependencies = [
  "frame-support",
  "frame-system",
  "pallet-balances",
- "pallet-transaction-payment-rpc-runtime-api",
  "parity-scale-codec",
  "serde",
+ "serde_json",
  "smallvec 1.5.0",
  "sp-core",
  "sp-io",
@@ -5139,7 +5139,6 @@ dependencies = [
  "jsonrpc-derive",
  "pallet-transaction-payment-rpc-runtime-api",
  "parity-scale-codec",
- "serde",
  "sp-api",
  "sp-blockchain",
  "sp-core",
@@ -5151,13 +5150,10 @@ dependencies = [
 name = "pallet-transaction-payment-rpc-runtime-api"
 version = "2.0.1"
 dependencies = [
- "frame-support",
+ "pallet-transaction-payment",
  "parity-scale-codec",
- "serde",
- "serde_json",
  "sp-api",
  "sp-runtime",
- "sp-std",
 ]
 
 [[package]]