Improve the openCypher TCK conformance

[habedi]

• Fixed the remaining 21 TCK conformance failures.
• Updated lbug crate to version 0.20.2 (in the benchmark harness).
• Proofread the docs against the codebase (and fixed a few CLI bugs).
• Updated Python dependencies.

[codecov]

Codecov Report

❌ Patch coverage is 85.44233% with 130 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/issundb-cypher/src/exec/read.rs	71.01%	80 Missing ⚠️
crates/issundb-cypher/src/parser.rs	85.62%	23 Missing ⚠️
crates/issundb-cypher/src/exec/expr.rs	65.30%	17 Missing ⚠️
crates/issundb-cypher/src/plan/logical.rs	92.59%	6 Missing ⚠️
crates/issundb-cypher/src/exec/write.rs	95.65%	2 Missing ⚠️
crates/issundb-cypher/src/exec/factorize.rs	0.00%	1 Missing ⚠️
crates/issundb-cypher/src/plan/physical.rs	93.33%	1 Missing ⚠️

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