DD support for RP2040 bootloader options

[waffle87]

Description

Adds mappings to configure:

• RP2040_BOOTLOADER_DOUBLE_TAP_RESET: rp2040_bootloader.double_tap_reset
• RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT: rp2040_bootloader.double_tap_reset_timeout
• RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED: rp2040_bootloader.double_tap_reset_led

Switches to using UINT32_C() macro to type the value when it is used, rather than where it is defined.

Types of Changes

• Core
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[drashna]

I feel like bootloader.rp2040.(options) would make more sense here, and be a bit more future proof. But implementing might be problematic

[waffle87]

I agree that might be more future proof, and qmk_lufa_bootloader could potentially be migrated under bootloader as well.

Will see what I can do, along with migrating existing keyboards and migration support in info.py.

[zvecr]

Bootloader is already used, and isn't an object so can't be implemented that way.

[drashna]

Bootloader is already used, and isn't an object so can't be implemented that way.

Yup, I figured as much. :/

bootloader_settings might work though?