FIX server#143

Summary

Fix for https://gitlab.com/caosdb/caosdb-server/-/issues/143

Focus

• Changes to the Parser and Lexer rules are necessary to parse anything like 1e2 m^2 as "number" plus "unit".
• Changes to the POV filter are necessary because the old implementation would interpret 1e2 as integer "1" with unit "e2".

Test Environment

• Tests in caosdb-pyinttest!60 (merged)
• No manual testing necessary

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