optimize /runOpenApi to allow pre-dereferencing OpenAPI Spec

[snowe2010]

This PR fixes an issue where the openApi plugin would try to dereference the
OpenAPI spec for each plugin when the plugin is run rather than on
initialization.

I did not attempt to fix the issue for every plugin, I simply wanted to start with
the one that was affecting me the most, the Github plugin. But this PR
adds the capability to allow any OpenAPI plugin to now use a pre-dereferenced
OpenAPI.Document instead of de-referencing during runtime.

Before:

/plugins averaged 19.472ms before the change
/runPluginQuery averaged 6867.030ms before the change

GET /node-service/api/plugins 200 17.112 ms - 31024
POST /node-service/api/runPluginQuery 200 6622.313 ms - 156023
GET /node-service/api/plugins 200 17.698 ms - 31024
POST /node-service/api/runPluginQuery 200 6632.372 ms - 156023
GET /node-service/api/plugins 200 25.301 ms - 31024
POST /node-service/api/runPluginQuery 200 7055.684 ms - 156023
GET /node-service/api/plugins 200 17.178 ms - 31024
POST /node-service/api/runPluginQuery 200 6835.205 ms - 156023
GET /node-service/api/plugins 200 16.735 ms - 31024
POST /node-service/api/runPluginQuery 200 7005.931 ms - 156023
GET /node-service/api/plugins 200 22.808 ms - 31024
POST /node-service/api/runPluginQuery 200 7050.673 ms - 156023

After:

/plugins averaged 20.302ms after the change
/runPluginQuery averaged 1533.787ms after the change

GET /node-service/api/plugins 200 77.839 ms - 31024
POST /node-service/api/runPluginQuery 200 1824.782 ms - 156023
GET /node-service/api/plugins 200 6.849 ms - 31024
POST /node-service/api/runPluginQuery 200 1525.905 ms - 156023
GET /node-service/api/plugins 200 15.647 ms - 31024
POST /node-service/api/runPluginQuery 200 1400.096 ms - 156023
GET /node-service/api/plugins 200 3.265 ms - 31024
POST /node-service/api/runPluginQuery 200 1498.696 ms - 156023
GET /node-service/api/plugins 200 9.287 ms - 31024
POST /node-service/api/runPluginQuery 200 1625.815 ms - 156023
GET /node-service/api/plugins 200 8.925 ms - 31024
POST /node-service/api/runPluginQuery 200 1427.427 ms - 156023

That's a 77.67% decrease in runtime for the /runPluginQuery, but a 4.27% increase for the /plugins query.
Without the 77ms outlier the results are much nicer:

(6.849 ms + 15.647 ms + 3.265 ms + 9.287 ms + 8.925 ms) / 5 = ≈ 8.795 ms
[(19.472 - 8.795) / 19.472] * 100 = ≈ 54.84 %

54.84% decrease in runtime for the /plugins query and a 77.67% decrease in runtime for the /runPluginQuery

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[FalkWolsky]

Thank you very much for this truly helpful contribution!