enhancements:
- scalar `Float` now have proper validation
- seqs are not copied anymore in some places, but using system.move
bugfixes:
- `removeWhitespaces` in test_common no longer eat white spaces
from quoted string.
- `skipWhitespace` in lexer.nim now preserve \r\n instead of replace it with \n
new features:
- add custom instrument infrastructure
- add Query Complexity instrumen
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