Create rules for changed HttpMethod class

[jmle]

According to the migration guide:

HttpMethod is now a class and no longer an enum. Though the public API has been maintained, some migration might be necessary (i.e. change from EnumSet to Set, use if else instead of switch). For the rationale behind this decision, see 27697.

Investigate and create rules if necessary.

In the rule description and message, try to be as verbose and clear as possible. Code examples are always welcome and useful. Feel free to use markdown syntax for these.

[konveyor-ci-bot]

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[jmle]

Straightforward, just look for usages of EnumSet<HttpMethod>. A code snippet should be easy to write. Right now Konveyor is not able to detect switch statements though.