I'd like to thank @marcotc for adding the issue templates in #2090!

Here's a few more tweaks inspired from the
[issue templates](https://github.com/DataDog/libdatadog/tree/main/.github/ISSUE_TEMPLATE)
we have for `libdatadog`.

For the bug report template:

* Mention log messages and screenshots in "steps to reproduce"
  suggestions
* Add a "How does ddtrace help you" section. This helps us to know
  more about the customer's use case, and also gives some space
  for customers to hopefully tell us what we're doing well

For the feature request template:

* Add a few sections to guide the feature request.