Enforce consistent and correct toml formatting (#2518)

Using taplo, fixes all our broken and inconsistent toml formatting and
adds CI to keep them tidy.

If people want we can customise the format rules as described here
https://taplo.tamasfe.dev/configuration/formatter-options.html

@ggwpez, I suggest zepter is used only for checking features are
propagated, and leave formatting for taplo to avoid duplicate work and
conflicts.

TODO
- [x] Use `exclude = [...]` syntax in taplo file to ignore zombienet
tests instead of deleting the dir

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/primitives/runtime-interface/proc-macro/Cargo.toml

@@ -21,4 +21,4 @@ proc-macro-crate = "1.1.3"
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
 expander = "2.0.0"
-syn = { version = "2.0.38", features = ["full", "visit", "fold", "extra-traits"] }
+syn = { version = "2.0.38", features = ["extra-traits", "fold", "full", "visit"] }