Add a bunch standard github actions checks that we use in our libraries

[cmaglie]

Here is an (incomplete) list to start:

• sync-labels (Add CI workflow to synchronize with shared repository labels #5)
• arduino-lint (Added arduino-lint check workflow #6)
• compile-sketches (to run a compile of the examples) (Added sketch compile workflow #7)
• report-size-deltas
• spell-check