chore: Add templates for bug reports and features

Author: tomasfarias

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in airflow-dbt-python
+title: "[Bug]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is. If possible, please include code samples to illustrate the bug.
+
+**Airflow**
+- Version: Which version or versions of Airflow are you using? 
+- Provider: Are you using an Airflow hosting provider? Which one?
+
+**Dbt**
+- Version: Which version of dbt are you using?

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature for airflow-dbt-python
+title: "[Feature]"
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the feature you would like to see implemented**
+A clear and concise description of what you want to happen.
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Additional context**
+Have you implemented the feature (at least partially)? If so, share your progress, or open a pull request! 
+Is the feature available in dbt but not in airflow-dbt-python?
+Are you looking to integrate dbt more closely with Airflow? How?
+Add any other context or screenshots about the feature request here.