[GitHub] Create a GitHub pull request template.

[chris-ramon]

Actual

Currently when creating PRs we need to write all the information from scratch.

Expected

We want to have the following PR template:

#### Details


#### Test Plan
:heavy_check_mark: Tested that the `CLI` works as expected via `./bin/test.sh`:
TBC.

:heavy_check_mark: Tested that the `CLI` works as expected via `./bin/start.sh`:
TBC.

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