chore: github templates + stalebot config

Author: rgommezz

.github/ISSUE_TEMPLATE.md

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+### Current Behavior
+
+- What code are you running and what is happening?
+- Include a screenshot if it makes sense.
+
+### Expected Behavior
+
+- What do you expect should be happening?
+- Include a screenshot or a video if it makes sense.
+
+### How to reproduce
+
+- You must provide a way to reproduce the problem.
+- Either re-create the bug on [Snack](https://snack.expo.io) or link to a GitHub repository with code that reproduces the bug.
+- Explain how to run the example app and any steps that we need to take to reproduce the issue from the example app, with as much details as possible.
+
+### Your Environment
+
+| package                           | version
+| ----------------                  | -------
+| react-native-scroll-bottom-sheet  |
+| react-native                      |
+| react-native-gesture-handler      |
+| react-native-reanimated           |
+
+

.github/PULL_REQUEST_TEMPLATE.md

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+Please provide enough information so that others can review your pull request:
+
+## Motivation
+
+Explain the **motivation** for making this change. What existing problem does the pull request solve?
+

.github/stale.yml

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+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 90
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 15
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - bug
+  - security
+# Label to use when marking an issue as stale
+staleLabel: wontfix
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: >
+  Closing this issue after a prolonged period of inactivity. If this is still present in the latest release, please feel free to create a new issue with up-to-date information.