Feat: after termination instructions return, break, continue do not allow other instructions

[mrLSD]

Description

After termination instructions return, break, and continue, if other instructions presented added errors to state. Related to issue #10.

Added additional tests that covers is it impossible to set exctra instructions after termination instructions.

This applies to statements:

• function-body
• if-body
• else-if-body
• if-loop-body
• else-if-loop-body
• loop-body

Loops

🏁 Checked if the return instruction was present, then removed extra jump-to: loop-end, and set-label: loop-end. And added the tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
src/semantic.rs	100.00% <100.00%> (ø)
src/types/error.rs	100.00% <ø> (ø)

... and 14 files with indirect coverage changes

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