New lint: decimal_bit_mask

[Artur-Sulej]

changelog: [decimal_bit_mask]: add a new lint that detects the use of decimal literals as bit masks in bitwise operations. Using decimal literals for bit masks can obscure the intended bit pattern and reduce code readability. This lint encourages the use of binary (0b...) or hexadecimal (0x...) notation to make bit patterns explicit and easier to understand at a glance.

Addresses issue: #1775

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Example:

let masked = x & 15; // Bad: decimal literal as bit mask
let masked = x & 0b1111; // Good: bit pattern is explicit

Summary Notes

• Feature-freeze by github-actions[bot]

Managed by @rustbot—see help for details

[github-actions]

Seems that you are trying to add a new lint!
We are currently in a feature freeze, so we are delaying all lint-adding PRs to September 18 and focusing on bugfixes.
Thanks a lot for your contribution, and sorry for the inconvenience.
With ❤ from the Clippy team

@rustbot note Feature-freeze
@rustbot blocked
@rustbot label +A-lint

[Artur-Sulej]

Although I annotated my test with //~ decimal_bit_mask, Clippy still reports the lint as an unmatched diagnostic and the test fails.
Any idea what I might be missing?