feat: Raw assembly blocks #83

Add the capability of using inline assembly with a asm block.

Furthermore, parameters will be able to be used (constraints) with the %x placeholder and parameters in the asm block declaration

Additionally, two flags can be toggled on each asm block:

• has side effect: Does the block have side effects. Default true. can be disabled by adding a @ after the asm.
• is stack aligned: Is the stack aligned. Default false. can be enabled by adding a ~ after the asm