fix #131 and #134 (white spaces in query)

Summary

• Fix for #131 (closed)
• Fix for #134 (closed)

Focus

• Problem with #134 (closed) was a too restrictive lexer rule (FROM rule). See CQLLexer.g4.
• Problem with #131 (closed) was a too restrictive parser rule (unit rule). See CQLParser.g4`.

Test Environment

Tests in caosdb-pyinttest!7 (merged)

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