feat: add `vm.getChain` cheatcodes to get chain info

[grandizzy]

Component

Forge

Describe the feature you would like

forge-std's StdChains provides a way to retrieve chain info for a chain id or chain alias: https://github.com/foundry-rs/forge-std/blob/6853b9ec7df5dc0c213b05ae67785ad4f4baa0ea/src/StdChains.sol#L69

However this can get easily out of sync when support for new chains is added. We can fix this by providing native cheatcodes vm.getChain(alias) and vm.getChain(chainId) that returns a Chain struct as https://github.com/foundry-rs/forge-std/blob/6853b9ec7df5dc0c213b05ae67785ad4f4baa0ea/src/StdChains.sol#L45

Additional context

No response

[redtrama]

can i get assigned to this one?

[mattsse]

assigned, lmk if you need some pointers, feel free to open a draft pr early

[Pratham1812]

If nobody has started working on this can I try this one? @mattsse