ci: add quick-check with rustfmt (#615)

* ci: add quick-check with clippy and rustfmt

* chore: rustfmt round

* chore: set the same rustfmt config than substrate

* chore: fix formatting

* cI: remove clippy

* ci: switch to nightly for the checks

* ci: fix toolchains and naming

* ci: Limit the check to formatting

* chore: fix formatting

* Update .rustfmt.toml

* Update .rustfmt.toml

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

.rustfmt.toml

@@ -1,2 +1,23 @@
-hard_tabs=true
-merge_imports=true
+# Basic
+hard_tabs = true
+max_width = 100
+use_small_heuristics = "Max"
+
+# Imports
+imports_granularity = "Crate"
+reorder_imports = true
+
+# Consistency
+newline_style = "Unix"
+
+# Misc
+binop_separator = "Back"
+chain_width = 80
+match_arm_blocks = false
+match_arm_leading_pipes = "Preserve"
+match_block_trailing_comma = true
+reorder_impl_items = false
+spaces_around_ranges = false
+trailing_comma = "Vertical"
+trailing_semicolon = false
+use_field_init_shorthand = true