Add GitHub issue templates (#925)

This PR adds a few github issue templates, allowing customers to give
feedback and report issues in a more structured way.

.github/ISSUE_TEMPLATE/cli-issue.md

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+---
+name: Bug report for the CLI
+about: Use this to report an issue with the CLI.
+title: ''
+labels: CLI
+---
+
+### Describe the issue
+A clear and concise description of what the issue is
+
+### Steps to reproduce the behavior
+Please list the steps required to reproduce the issue, for example:
+1. Run `databricks clusters ...`
+2. See error
+
+### Expected Behavior
+Clear and concise description of what should have happened
+
+### Actual Behavior
+Clear and concise description of what actually happened
+
+### OS and CLI version
+Please include the version of the CLI (eg: v0.1.2) and the operating system (eg: windows). You can run databricks --version to get the version of your Databricks CLI
+
+### Is this a regression?
+Did this work in a previous version of the CLI? If so, which versions did you try?
+
+### Debug Logs
+Output logs if you run the command with debug logs enabled. Example: databricks clusters list --log-level=debug. Redact if needed

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/dabs-issue.md

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+---
+name: Bug report for Databricks Asset Bundles
+about: Use this to report an issue with Databricks Asset Bundles.
+labels: DABs
+title: ''
+---
+
+### Describe the issue
+A clear and concise description of what the issue is
+
+### Configuration
+Please provide a minimal reproducible configuration for the issue
+
+### Steps to reproduce the behavior
+ Please list the steps required to reproduce the issue, for example:
+1. Run `databricks bundle deploy ...`
+2. Run `databricks bundle run ...`
+3. See error
+
+### Expected Behavior
+Clear and concise description of what should have happened
+
+### Actual Behavior
+Clear and concise description of what actually happened
+
+### OS and CLI version
+Please provide the version of the CLI (eg: v0.1.2) and the operating system (eg: windows). You can run databricks --version to get the version of your Databricks CLI
+
+### Is this a regression?
+Did this work in a previous version of the CLI? If so, which versions did you try?
+
+### Debug Logs
+Output logs if you run the command with debug logs enabled. Example: databricks bundle deploy --log-level=debug. Redact if needed