Add a ODBC.load convenience function that attempts to auto-generate a…

[quinnj]

… table and load any Tables.jl source. Fixes #222

[codecov]

Codecov Report

Merging #281 into master will increase coverage by 3.39%.
The diff coverage is 86.45%.

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
+ Coverage   74.88%   78.28%   +3.39%     
==========================================
  Files           5        6       +1     
  Lines         661      746      +85     
==========================================
+ Hits          495      584      +89     
+ Misses        166      162       -4     

Impacted Files	Coverage Δ
src/ODBC.jl	68.75% <ø> (ø)
src/utils.jl	79.01% <81.81%> (+3.68%)	⬆️
src/load.jl	85.71% <85.71%> (ø)
src/API.jl	67.08% <92.30%> (+1.29%)	⬆️
src/dbinterface.jl	93.90% <100.00%> (+4.94%)	⬆️

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