Split up `ink_linting` into two `dylint` libraries

[jubnzv]

ink_linting should be split up into two dylint-based libraries: ink_linting and ink_linting_extra.

In cargo-contract, we require only the essential lints that detect compilation errors in ink!; these are executed each time a contract is built. The lints from ink_linting_extra should remain optional, being executed only upon direct user request (e.g. cargo contract build --extra-lints). This approach is intended to speed up the build process.

For more context see: use-ink/cargo-contract#1412 (comment)

[deuszx]

Hi. Are you aware of scout?