Add support for ARRAY type

[Dreamsorcerer]

TODO: Sort out testing on a DB that supports ARRAY type

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (2e13f85) 97.61% compared to head (e5c0a5d) 97.20%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
aiohttp_admin/backends/sqlalchemy.py	61.29%	10 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #817      +/-   ##
==========================================
- Coverage   97.61%   97.20%   -0.42%     
==========================================
  Files          15       15              
  Lines        2268     2286      +18     
  Branches      371      372       +1     
==========================================
+ Hits         2214     2222       +8     
- Misses         24       33       +9     
- Partials       30       31       +1     

Flag	Coverage Δ
unit	96.98% <61.29%> (-0.42%)	⬇️

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