~ruther/vhdl-i2c

ref: 97979bc76df6402f9351e051be34b38da8b01930 vhdl-i2c/tb/mcu_slave d---------
refactor: get rid of sda, scl overrides, drive sda, scl directly
refactor: use 'H' std_logic state instead of custom pull up type
tests: add possibility to check sda stability in mcu_slave
tests: add mcu_slave counter tb
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