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

fix: make slave work

feat: handle ack in rx, tx