Feature ip address in campaign webhook

[dongilbert]

Please be sure you are submitting this against the staging branch.

Q	A
Bug fix?	N
New feature?	Y
Automated tests included?	Y
Related user documentation PR URL	mautic/documentation#296
Related developer documentation PR URL	/
Issues addressed (#s or URLs)	N/A
BC breaks?	N
Deprecations?	N

Description:

The send webhook campaign action can now work with {contactfield=ipAddress} which will return CSV of contact's IP addresses. Example campaign action setup:

Will return payload like this: test=tee&email=linhartescope+form2%40gmail.com&IP=127.0.0.1

Steps to test this PR:

1. Create a campaign with the webhook action.
2. Use the new token for IP addresses.
3. Create a Request bin or similar webhook catcher.
4. Run the campaign and check that the IP address token is converted to the correct value.

[mleffler]

This has been code reviewed and has had one test pass.

[escopecz]

I will actually move this out of the bug fix version to the feature version 2.15.0. Don, add the documentation whenever you'll get a chance.

[dongilbert]

@escopecz You wrote this featured, I just created the PR. Can you add documentation please?

[mleffler]

This has been tested and running in production for a while - ready to commit?

[Woeler]

This is great! Indeed ready to go.