Deprecate H* type re-exports, and rename to B* in the codebase

[DaniPopes]

⚠️ Base on #4737 (alloy) ⚠️

(Referring to H64, H256...)

• Remove H* types re-export; this means also renaming the types in the entire codebase:

- pub use alloy_primitives::{... BXXX as HXXX ...};
+ pub use alloy_primitives::{... BXXX ...};

• Re-add H* types with a hidden, deprecated type alias for backwards compatibility:

#[doc(hidden)]
#[deprecated = "use BXXX instead"]
pub type HXXX = BXXX;

Note: you might want to wait until the rest of #4715 is done to avoid conflicts

[supernovahs]

Can I take this

[supernovahs]

Should I push in accordance with alloy branch?

[DaniPopes]

Yes please!