tests: add regs mcu_slave test
feat: add unexpected_sda tx signal
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
chore: split mcu_slave tb to separate library
tests: rename startstop_condition_detector testbench to contain tb
tests: add messages to checks
tests: add pull up sda, scl behavior
tests: split master i2c functions to separata package
tests: add mcu tests working with slave top designs
chore: add Vivado project for Basys 3 board
chore: fix slave naming in mcu slave designs
feat: add counter and register testing slave top levels
fix: activate pad_io in open drain on enable = 1
feat: add clear_buffer input to tx
tests: add slave testbench
fix: correct delay pulses length