✨ Warn if curating against gene symbols

[Zethson]

Fixes https://github.com/laminlabs/bionty/issues/143

• Adds a warning if the var_index is bt.Gene.symbol to check out the FAQ for more details on why this is bad
• I decided against hard coding a URL because it can change.
• I decided against adding this warning in curate() because it would get triggered repeatedly which can be annoying

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.60%. Comparing base (57fbd29) to head (4624ae9). Report is 14 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2142 +/- ## ========================================== + Coverage 92.53% 92.60% +0.06% ========================================== Files 55 55 Lines 6467 6474 +7 ========================================== + Hits 5984 5995 +11 + Misses 483 479 -4 ```

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