Add definitions for MotorGo Plink, Mini, Axis

[SwapnilPande]

This PR contains the latest board definitions for the Plink, Mini, and Core. The merge checklists are listed below for each board.

Plink

• Install the new board definitions
• Run the main program in this repository to check I2C, LED, and serial
• Run the example spin_motors example from the driver to verify that motors and encoders work as expected
• Connect the Pihat compatible boards to a Pi and try communicating over SPI with the Pi
• Confirm the voltage and current limits for the drivers is correct
• Confirm that all motor driver pins are set low on boot

Mini

• Install the new board definitions
• Run the main program in this repository to check I2C, LED, and serial
• Run the example spin_motors example from the driver to verify that motors and encoders work as expected
• Connect the Pihat compatible boards to a Pi and try communicating over SPI with the Pi
• Confirm the voltage and current limits for the drivers is correct
• Confirm that all motor driver pins are set low on boot

Axis

• Install the new board definitions
• Run the main program in this repository to check I2C, LED, and serial
• Run the example spin_motors example from the driver to verify that motors and encoders work as expected
• Connect the Pihat compatible boards to a Pi and try communicating over SPI with the Pi
• Confirm the voltage and current limits for the drivers is correct
• Confirm that all motor driver pins are set low on boot

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Added definitions for core, mini, and plink": summary looks empty type/action looks empty the commit message "Finalized MotorGo variant files": summary looks empty type/action looks empty the commit message "Renamed boards to match new naming convention": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

	Messages
📖	You might consider squashing your 3 commits (simplifying branch history).

👋 Hello SwapnilPande, we appreciate your contribution to this project!

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