Lint bit operations with decimal constants

[clarfonthey]

For example, something like x & 12 could be better represented as x & 0b1100, and x | 1024 could be better represented as x | (1 << 9).

Not sure the extent to which this should be, but it'd be nice if we could cover a few cases.

[oli-obk]

For literals I agree, but I'm not so sure about bringing constants into the mix.

Also needs some (configurable?) setting to choose at which point to stop suggesting bitshifts and suggesting binary literals instead. Also hexadecimal literals might be preferred by some (although binary literals are clearer imo)

[Artur-Sulej]

@rustbot claim