feat(pallet-xcm): Add supported_version to pallet-xcm genesis config

[RomarQ]

Relates to: polkadot-fellows/runtimes#544
Closes #9075

Adds a supported_version field to the pallet-xcm genesis config. Which allows specifying versioned locations at genesis.

[bkontur]

/cmd fmt

[RomarQ]

Added major to the bump field since it is a breaking change. Let me know if I should change it to something else.

[bkontur]

Added major to the bump field since it is a breaking change. Let me know if I should change it to something else.

yes, let's wait for SemVer CI job and see

[bkontur]

Added major to the bump field since it is a breaking change. Let me know if I should change it to something else.

yes, let's wait for SemVer CI job and see

Well, yes, it needs to be major.

---

But if we have all the fields private and use some builder pattern for GenesisConfigs, then adding new fields wouldn't cause major all the time.

I think it should be quite easy to expand builder functions for all GenesisConfig struct fields on #[pallet::genesis_config], something like this:

impl<T: Config> GenesisConfig<T> {
        pub fn safe_xcm_version(mut self, safe_xcm_version: Option<XcmVersion>) -> GenesisConfig<T> {
            self.safe_xcm_version = safe_xcm_version;
            self
        }

        pub fn supported_version(mut self, supported_version: Vec<(Location, XcmVersion)>) -> GenesisConfig<T> {
            self.supported_version = supported_version;
            self
        }
    }

I will probably created a separate issue, looks like a very nice easy DX improvement: #9228

[bkontur]

@RomarQ thank you :)