tests: add startstop condition generator testbench
fix: make sure scl changed after delay
tests: add test for scl generator
fix: mcu slave tbs, wait for sync rst
feat: synchronize reset in mcu slave tops
chore: get rid of "pulse" from scl names
feat: handle errors in slave state
Moves logic of error handling to slave_state
from tx entity.
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
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
feat: add clear_buffer input to tx
tests: add slave testbench