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>

cumulus/parachain-template/node/Cargo.toml

@@ -57,7 +57,7 @@ substrate-prometheus-endpoint = { path = "../../../substrate/utils/prometheus" }
 # Polkadot
 polkadot-cli = { path = "../../../polkadot/cli", features = ["rococo-native"] }
 polkadot-primitives = { path = "../../../polkadot/primitives" }
-xcm = { package = "staging-xcm", path = "../../../polkadot/xcm", default-features = false}
+xcm = { package = "staging-xcm", path = "../../../polkadot/xcm", default-features = false }
 
 # Cumulus
 cumulus-client-cli = { path = "../../client/cli" }
@@ -91,4 +91,3 @@ try-runtime = [
 	"polkadot-cli/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-