tests: add startstop condition generator testbench

fix: start stop condition generator behavior

fix: make sure scl changed after delay

tests: add test for scl generator

fix: scl generator minor mistakes

feat: add master top entity

fix: mcu slave tbs, wait for sync rst

chore: test flags for ghdl to compile

feat: synchronize reset in mcu slave tops

feat: add master state entity

feat: add scl generator

feat: add address generator

feat: add start, stop condition generator

feat: add waiting output to slave

feat: add done fields to tx, rx

tests(mcu): count correctly, excluding the address

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