Add pico-de-gallo battery example

[tullom]

Add support for examples with the pico-de-gallo development board.

This PR sets up a new workspace for pico-de-gallo examples and adds an example that runs the battery service with the bq40z50-r5 fuel gauge connected to the pico-de-gallo's I2C bus.

[github-actions]

Cargo Vet Audit Failed

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