Cleanup Repository & Fix CI (#211)

* Move all scripts to a single directory

* Switch to cargo-make

* Remove the polkadot-sdk from the submodules

* WIP: update the CI

* Add other jobs to CI

* Overhaul the polkadot-sdk caching step

* Add a testing step

* Fix the CI

* Install clang and llvm dependencies

* Update the version of clang

* Install llvm on macos

* Fix ci

* Fix ci

* Use 1.90.0 version of rust for the polkadot-sdk

* Fix CI

* Fix CI

* Fix CI

* Fix CI

* Fix CI

* Allow warnings

* Update runners

* Update runners

* Simplify CI

* Update MacOS runner

* Fix zombienet tests

* Make cache step faster

.gitignore

@@ -3,6 +3,7 @@
 .DS_Store
 node_modules
 /*.json
+*.sh
 
 # We do not want to commit any log files that we produce from running the code locally so this is 
 # added to the .gitignore file.
@@ -13,7 +14,4 @@ workdir
 
 !/schema.json
 !/dev-genesis.json
-
-# Ignore all shell scripts except for the `run_tests.sh` script
-*.sh
-!run_tests.sh
+!/scripts/*