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>

polkadot/parachain/test-parachains/undying/collator/Cargo.toml

@@ -41,4 +41,4 @@ sp-keyring = { path = "../../../../../substrate/primitives/keyring" }
 tokio = { version = "1.24.2", features = ["macros"] }
 
 [features]
-network-protocol-staging = [ "polkadot-cli/network-protocol-staging" ]
+network-protocol-staging = ["polkadot-cli/network-protocol-staging"]