cats effect 3: pass transaction info by implicits

[richard-gibson]

Before contributing, please read our contributing guidelines and code of conduct.

Overview

This is a change to the newrelic scala cats 3 api. The change ensures transaction and current token information is passed by parameters rather than ThreadLocal variables. Parameters used are implicit, this helps to keep API changes to a minimum

Related Github Issue

Include a link to the related GitHub issue, if applicable
#406

Testing

The agent includes a suite of tests which should be used to
verify your changes don't break existing functionality. These tests will run with
Github Actions when a pull request is made. More details on running the tests locally can be found
here,

Checks

[N] Are your contributions backwards compatible with relevant frameworks and APIs?
A small breaking change was necessary for the Cats Effect 3 API.

    val txnBlock: IO[Int] = txn(
      for {
        one <- asyncTrace("one")(IO(1))
        two <- asyncTrace("two")(IO(one + 1))
        three <- asyncTrace("three")(IO(two + 1))
      } yield three
    )

now becomes

    val txnBlock: IO[Int] = txn(implicit txnInfo =>
      for {
        one <- asyncTrace("one")(IO(1))
        two <- asyncTrace("two")(IO(one + 1))
        three <- asyncTrace("three")(IO(two + 1))
      } yield three
    )

[ Y] Does your code contain any breaking changes? Please describe.
See above
[ N] Does your code introduce any new dependencies? Please describe.

[GDownes]

Remove comment