Provide an API to ignore calculating apdex on the active transaction

[bizob2828]

Description

A few language agents: java, .net, and ruby have the ability to omit collecting apdex metrics for an active transaction.

Acceptance Criteria

As a user I want the ability to ignore collecting apdex metrics for the active transaction.

Design Consideration/Limitations

add a ignoreApex property to transaction and when _setApdex is called and ignoreApex is true, it should log warning and exit early.

api.ignoreApdex - it will create a supportability metric when created, it will try to get the active transaction and if there is one it'll set the ignoreApdex property on transaction

Additional context

• Ruby agent implementation
• Java agent
• .Net agent

[workato-integration]

https://new-relic.atlassian.net/browse/NR-258244

[slider]

I'd like to +1 on this, we have a use case with long running calls that are polling an external API and as a result out Appdex value gets skewed by this.