Add type information for typescript

[nicolaichuk]

@trentm Please review and merge to upstream.

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• Start Time: 2022-11-03T19:43:14.428+0000

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[trentm]

@nicolaichuk Thanks for the PR, and my apologies for the long time in replying. I don't want to take a large .d.ts file for this package because:

• It would be a maintenance burden, for example to keep the Transaction, Span, Error, Metricset types in sync with the schema from https://github.com/elastic/apm-server/tree/main/docs/spec/v2.
• My expectation is that the only direct user of this repo is the APM agent at https://github.com/elastic/apm-agent-nodejs. I may be mistaken, but I expect there are very few users that benefit from using the apm HTTP client directly. (Recently in chore: include http apm client apm-agent-nodejs#3507 this http-client package was moved into the elastic/apm-agent-nodejs repo and the plan is to archive this repo.)

We would possibly consider exporting times for the http-client in that repo, but the same maintenance issue with such a well-defined, large .d.ts file would still apply.