add .editorconfig

[rursprung]

Is your feature request related to a problem? Please describe.
due to the lack of an .editorconfig PRs are not properly aligned in terms of formatting, etc.

Describe the solution you'd like
add a .editorconfig with generally agreed upon defaults. note that the main OpenSearch repo contains a .editorconfig which would be a good starting point.

Describe alternatives you've considered
using .editorconfig is the de-facto standard.

Additional context
i didn't check the status of the other OpenSearch repos. if it's missing in them as well this might be well suited for a meta-issue which is then applied to all of them (so that all have the same .editorconfig.

side-note: adding a .gitattributes in the same step might be a good idea. again, this file is present in the main OpenSearch repo but missing here.

[davidlago]

Sorry for the late reply. We use checkstyle for linting, and we've documented how to run locally prior to submitting PRs here

[rursprung]

@davidlago: one tool doesn't exclude the other: checkstyle is used to check the style, editorconfig is used to configure the editor. the latter allows formatting the code automatically in the correct way expected by the former. the two tools are complimentary. please re-consider (not just for the security plugin, in general for all OpenSearch repos).

[davidlago]

Gotcha... let me re-open, perhaps we should move this to the org level as a broader question/recommendation that perhaps we can make there.