Add ParameterType.LONG

[arniu]

Motivation:

Add missing LONG

Conformance:

Your commits should be signed and you should have signed the Eclipse Contributor Agreement as explained in https://github.com/eclipse/vert.x/blob/master/CONTRIBUTING.md
Please also make sure you adhere to the code style guidelines: https://github.com/vert-x3/wiki/wiki/Vert.x-code-style-guidelines

[slinkydeveloper]

Hello, thanks for contributing! Can i ask what is the reason of this change? Also, yuo need to sign the eclipse eca and signoff your commits

[arniu]

Long was supported in RequestParameter, while absent in ParameterType.

vertx-web/vertx-web-api-contract/src/main/java/io/vertx/ext/web/api/RequestParameter.java

Lines 110 to 117 in 63717b7

	@Nullable Long getLong();
	/**
	* Returns true if value of RequestParameter is a Long instance
	*
	* @return
	*/
	boolean isLong();

[slinkydeveloper]

sounds good to me. Can you sign off the commits and sign the eclipse eca?