Allow JSON.ARRINDEX with none scalar values

[gkorland]

fix #886

127.0.0.1:6379> json.set a $ '{"a":[[1, 2], [2,3]], "b":[[2,4], [1,2]]}'
OK
127.0.0.1:6379> JSON.ARRINDEX a $.* '[1,2]'
1) (integer) 0
2) (integer) 1


127.0.0.1:6379> json.set a $ '{"a":[{"b":1}, {"c":2}], "b":[{"b":1}, {"c":2}]}'
OK
127.0.0.1:6379> JSON.ARRINDEX a $.* '{"c":2}'
1) (integer) 1
2) (integer) 1

[codecov]

Codecov Report

Base: 81.41% // Head: 81.40% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (7a3e7b6) compared to base (f43dfb8).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #892      +/-   ##
==========================================
- Coverage   81.41%   81.40%   -0.01%     
==========================================
  Files          14       14              
  Lines        3879     3872       -7     
==========================================
- Hits         3158     3152       -6     
+ Misses        721      720       -1     

Impacted Files	Coverage Δ
src/commands.rs	95.68% <100.00%> (+0.04%)	⬆️

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