introduce Checkstyle, start enforcing whitespace related rules (FINERACT-821) #689
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Once #688 which bulk cleans up all existing whitespace issues,
after a rebase and verification (or more PRs) that there are no other new issues,
this PR contributes an initial Checkstyle configuration which will fails builds/PR for new whitespace issues.
The initial Checkstyle XML configuration contributed here has many more rules, but all non whitespace related ones are still commented out for now; the idea being that we (myself or, hopefully, other contributors!) then gradually enable more of those rules, after fixing existing violations.
See https://issues.apache.org/jira/browse/FINERACT-821 for full background.