More tests, and performance profiling

[thibaudcolas]

• Adds CPU and memory profiling
• Adds a skipped test case for If statement wrapping attributes need white at the end #37.
• Optimizes the CI build performance
• Adds a (slightly) improved message for: dynamic attributes cause parse error #23 (comment)
• Fixes a Python 3.10 deprecation warning
• Moves all remaining tests to pytest