find: Add option to ignore case

[fd0]

Closes #859

[codecov-io]

Codecov Report

Merging #864 into master will decrease coverage by -0.03%.
The diff coverage is 37.5%.

@@            Coverage Diff             @@
##           master     #864      +/-   ##
==========================================
- Coverage   53.44%   53.42%   -0.03%     
==========================================
  Files          92       92              
  Lines        7624     7631       +7     
==========================================
+ Hits         4075     4077       +2     
- Misses       2934     2937       +3     
- Partials      615      617       +2

Impacted Files	Coverage Δ
src/cmds/restic/cmd_find.go	49.51% <37.5%> (-1.53%)	❌

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