Panic on duplicate field names fixes #1601

[PSeitz]

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[codecov-commenter]

Codecov Report

Merging #1647 (5ca01c2) into main (c24157f) will increase coverage by 0.05%.
The diff coverage is 94.01%.

@@            Coverage Diff             @@
##             main    #1647      +/-   ##
==========================================
+ Coverage   93.97%   94.03%   +0.05%     
==========================================
  Files         253      254       +1     
  Lines       47716    48158     +442     
==========================================
+ Hits        44843    45283     +440     
- Misses       2873     2875       +2     

Impacted Files	Coverage Δ
fastfield_codecs/src/main.rs	0.52% <0.00%> (-0.01%)	⬇️
src/fastfield/writer.rs	88.52% <0.00%> (ø)
src/indexer/sorted_doc_id_multivalue_column.rs	95.00% <0.00%> (ø)
src/query/bitset/mod.rs	99.45% <ø> (ø)
src/query/mod.rs	100.00% <ø> (ø)
src/fastfield/multivalued/writer.rs	98.86% <50.00%> (ø)
src/schema/field_type.rs	77.52% <50.00%> (+1.10%)	⬆️
src/fastfield/multivalued/reader.rs	83.17% <60.00%> (-2.40%)	⬇️
src/indexer/sorted_doc_id_column.rs	95.00% <66.66%> (ø)
src/schema/schema.rs	98.64% <66.66%> (-0.15%)	⬇️
... and 31 more

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