~ruther/vhdl-i2c

ref: 9424c7dd54ee182e7d5b476d8e4bb49650fe05ec vhdl-i2c/src/mcu_slave d---------
tests: add possibility to check sda stability in mcu_slave
tests: add mcu tests working with slave top designs
chore: fix slave naming in mcu slave designs
feat: add counter and register testing slave top levels
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