[try-runtime-cli] Offchain worker support (#8966)

* make remote-ext work with ws and safe RPCs

* Update docs.

* Update utils/frame/remote-externalities/Cargo.toml

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

* Fix test

* Update lock file

* Update utils/frame/remote-externalities/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Fix build again.

* checkpoint, merging the paged rpc now

* revert lifetime stuff

* WIP: remote client init not working

* Small cleanups

* use jsonrpsee alpha.7

* WIP

* Executiing without errors

* Reorg & cleanup

* Trivial cleaning

* Add txpool & keystore extension

* Small cleaning

* More :cleaning

* Flags: page-size, override-code

* WIP

* Apply suggestions from code review

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Remove heap_pages

* Dry code extraction from state

* Formatting

* More formatting

* Add issue todo

* Use jsonrpsee 0.2.0

* Try trigger gitlab

* Fix "block_import_works" test

* fix native_big_block_import_fails_on_fallback test

* fix commit should work

* Rewrite UI tests

* Revert "Rewrite UI tests"

This reverts commit ada7f670f701c21fb399946a3f6918453f537bcb.

* try again with UI

* Use const for legacy heap pages val

* Move parse module to its own file

* Move rpc_api module to its own file

* Apply suggestions from code review

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* trait names: Block, not B

* Corect HEAP_PAGES_TEST_LEGACY export

* Update utils/frame/remote-externalities/src/rpc_api.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Revert test_ext heap_page insert; adjust storage root instead

* Doc comments for try_runtime::cli::Command

* TryRuntime stub

* trailing comma

* Remove unused dev dep in frame-executive

* Improve parse::hash variable name & error index

* Use Result for rpc_api fns

* Richer err messagges

* Remove HEAP_PAGE_TEST_LEGACY

* Update bin/node/executor/tests/basic.rs

Co-authored-by: kianenigma <kian@parity.io>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

substrate/Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "Inflector"
 version = "0.11.4"
@@ -6787,6 +6789,7 @@ dependencies = [
  "log",
  "pallet-elections-phragmen",
  "parity-scale-codec",
+ "serde",
  "serde_json",
  "sp-core",
  "sp-io",
@@ -10647,14 +10650,17 @@ dependencies = [
  "log",
  "parity-scale-codec",
  "remote-externalities",
+ "sc-chain-spec",
  "sc-cli",
  "sc-client-api",
  "sc-executor",
  "sc-service",
+ "serde",
  "sp-api",
  "sp-blockchain",
  "sp-core",
  "sp-externalities",
+ "sp-keystore",
  "sp-runtime",
  "sp-state-machine",
  "structopt",