feat: improve term search with full-text index (#109)

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (bb9ae14) 72.71% compared to head (8425e7e) 73.00%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/server/mod.rs	0.00%	12 Missing ⚠️
src/index.rs	86.76%	9 Missing ⚠️
src/server/actix_server/hpo_terms.rs	89.33%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   72.71%   73.00%   +0.28%     
==========================================
  Files          13       14       +1     
  Lines         931     1041     +110     
==========================================
+ Hits          677      760      +83     
- Misses        254      281      +27     

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