ci: add support for dependabot + templates

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+<!--
+NOTICE: While GitHub is the preferred channel for reporting issues/feedback, this is not a mechanism for receiving support under any agreement or SLA. If you require immediate assistance, please use official support channels.
+-->
+
+<!--
+FOR BUGS RELATED TO THE SALEFORCE CLI, please use this repository: https://github.com/forcedotcom/cli/issues
+-->
+
+### Summary
+
+_Short summary of what is going on or to provide context_.
+
+### Steps To Reproduce:
+
+1.  This is step 1.
+1.  This is step 2. All steps should start with '1.'
+
+### Expected result
+
+_Describe what should have happened_.
+
+### Actual result
+
+_Describe what actually happened instead_.
+
+### Additional information
+
+_Feel free to attach a screenshot_.
+
+**VS Code Version**:
+
+**SFDX CLI Version**:
+
+**OS and version**:

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+---
+
+**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 [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+### What does this PR do?
+
+### What issues does this PR fix or reference?

.github/dependabot.yml

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+version: 2
+updates:
+    - package-ecosystem: 'npm'
+      directory: '/'
+      schedule:
+          interval: 'weekly'
+          day: 'saturday'
+      versioning-strategy: 'increase'
+      labels:
+          - 'dependencies'
+      open-pull-requests-limit: 10
+      pull-request-branch-name:
+          separator: '-'
+      commit-message:
+          # cause a release for non-dev-deps
+          prefix: fix(deps)
+          # no release for dev-deps
+          prefix-development: chore(dev-deps)
+      ignore:
+          - dependency-name: '@salesforce/dev-scripts'