accept multiple values for tags in dogstatsd

[patrick-vandusen-creditgenie]

What does this PR do?

Accepts arrays of tag values in dogstatsd.

Motivation

We need it, Datadog supports it, datadog-lambda-js can already do it, there's no reason dogstatsd shouldn't be able to do it too.

[BridgeAR]

@patrick-vandusen-creditgenie adding this is going to cause quite some overhead for everyone. Would it not be fine to just use a small helper method that calls the API after transforming it to the regular format?

[patrick-vandusen-creditgenie]

@BridgeAR

@patrick-vandusen-creditgenie adding this is going to cause quite some overhead for everyone.

I haven't noted significant overhead from the use of Array.isArray, can you elaborate on why you believe that will be the case?

Would it not be fine to just use a small helper method that calls the API after transforming it to the regular format?

I tried to find a way to do this within the existing interface of dd-trace but wasn't able to, could you explain how you would approach this?

[rochdev]

@tlhunter What was the reason the original API didn't accept ['foo:bar', 'foo:baz'] since that's the format of the underlying implementation?

[rochdev]

I opened #5748 to support this in the same way as the underlying protocol/implementation instead.