refactor: Query terminology, update docs

[DRK3]

• Updated some of the terminology used for queries to be more accurate. In many instances, the term "index" was being used when really "attribute" was more appropriate. This difference will become important in my next commit when I add an endpoint to create indexes.

• Updated some out-of-date documentation.

• Removed some unneeded code.

Signed-off-by: Derek Trider Derek.Trider@securekey.com

[codecov[bot]]

Codecov Report

Merging #240 (e2c6515) into main (70c892b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #240   +/-   ##
=======================================
  Coverage   85.04%   85.04%           
=======================================
  Files          13       13           
  Lines        1558     1558           
=======================================
  Hits         1325     1325           
  Misses        145      145           
  Partials       88       88           

Impacted Files	Coverage Δ
cmd/edv-rest/startcmd/start.go	80.96% <ø> (ø)
pkg/edvprovider/edvprovider.go	89.81% <ø> (ø)
pkg/restapi/operation/operations.go	85.95% <ø> (ø)

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