embassy-rp: Add PioClk [and mclk to I2S] #4962
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Add a simple PIO program for outputting a square wave of given frequency.
Switch to pio_programs::clock_divider::calculate_pio_clock_divider_value for clock divider calculation for I2S PIO programs.
Change PioBatch to enable user to start two PIO based drivers at the same time.
PioBatch could be further extended so that the drivers could register callbacks to be executed after state machine is started. Current code does not need it so I haven't added this.
I'm not sure with some of names I've used. If anybody has better ideas do let me know.
Test: I've run pio_i2s and pio_clk examples and checked all outputs with an oscilloscope.