Introduce SqlInputError with offset

[gwenn]

Should fix #1130

• sqlite3_declare_vtab ?
• offset specified only when code is SQLITE_ERROR ?
• Batch => offset relative to SqlInputError.sql (not Batch.sql)
• execute_batch => offset relative to SqlInputError.sql (not execute_batch sql parameter)
• modern_sqlite feature, I know...

[codecov]

Codecov Report

Merging #1137 (8f40fd1) into master (f54e550) will increase coverage by 0.04%.
The diff coverage is 82.14%.

@@            Coverage Diff             @@
##           master    #1137      +/-   ##
==========================================
+ Coverage   78.82%   78.86%   +0.04%     
==========================================
  Files          48       48              
  Lines        6034     6051      +17     
==========================================
+ Hits         4756     4772      +16     
- Misses       1278     1279       +1     

Impacted Files	Coverage Δ
src/error.rs	26.44% <75.00%> (+12.16%)	⬆️
src/statement.rs	91.93% <90.00%> (-0.05%)	⬇️
src/inner_connection.rs	66.29% <100.00%> (-0.57%)	⬇️
src/types/mod.rs	95.20% <0.00%> (-0.25%)	⬇️
src/lib.rs	89.62% <0.00%> (-0.02%)	⬇️
src/busy.rs	62.06% <0.00%> (+0.77%)	⬆️

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[thomcc]

Looks fine to me. Anything else you want to do with it still?