Support Cairo 0.10 (#184)

* add new account artifacts

* migrate cairo syntax

* bump cairo lang

* remove Makefile from base project

* update signer

* clear debug code

* fix linter

* Update __init__.py

* drop python3.7 support

* remove nonce from execute params. fix max_fee type

* fix linter

* fix test

* fix tests

* fix linting

* add missing docstring

* improve tests. simplify calldata management

* fix linter

* fix gateway flags

* apply code review suggestions. signer takes hex or int

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         # Add '3.10-dev' once frozendict issue is resolved
         # See https://github.com/starkware-libs/cairo-lang/issues/38
-        python_version: [ '3.7.5', '3.8', '3.9' ]
+        python_version: [ '3.8', '3.9' ]
         os: [ubuntu-latest]
     name: ${{ matrix.os }} - Python ${{ matrix.python_version }}
     steps: