RTR: x-okapi-token, step 8; Provide support for multiple headers.

[kaladay]

We cannot simply just grab the first matching header.

This is especially important because the Set-Cookie can be any number of cookies.
Not to mention, that each Set-Cookie value string could also be an array of cookies (as per the standards).

We cannot reliably use RTR with this limitation.

Improve the design to support an array of values.
This is to be accomplished by implementing an asArray Boolean on the EmbeddedVariable in mod-workflow.
Then, in mod-camunda add support for the newly added asArray value.
Make sure the spin is supported as well.

A login example workflow should also be built.

see:

mod-camunda/src/main/java/org/folio/rest/camunda/delegate/RequestDelegate.java

Line 98 in 667da59

Optional<String> headerOutput = Optional.ofNullable(response.getHeaders().getFirst(key.get()));

see: https://github.com/TAMULib/mod-workflow/blob/ed977db83c0bebf43706f4c4312b33025c09307b/components/src/main/java/org/folio/rest/workflow/model/EmbeddedVariable.java#L17