Added issue and merge request templates (baserow#4088)

Author: bram2w

.github/ISSUE_TEMPLATE/bug.yml

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+name: 🪲 Bug Report
+description: Report a reproducible bug in Baserow.
+labels: ["needs feedback ⚠️", "bug 🪲"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        If you have a question about Baserow, please post it on the community forum:
+        https://community.baserow.io/
+
+  - type: textarea
+    id: describe-problem
+    attributes:
+      label: Describe the problem
+      description: A brief description of the bug.
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: List the steps required to reproduce the error.
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual-result
+    attributes:
+      label: Actual result
+      description: What currently happens in Baserow.
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected-result
+    attributes:
+      label: Expected result
+      description: What you expected to happen instead.
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Describe how you're running Baserow.
+      placeholder: |
+        - Operating System: Windows/Ubuntu/Mac/etc.
+        - Web Browser: Chrome / Firefox / Edge / Safari
+        - Deployment Type: baserow.io / docker / other
+        - Baserow Version: 1.8 / 1.7 / develop

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 💬 Community Forum
+    url: https://community.baserow.io/
+    about: Ask questions and brainstorm ideas with the community.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 💡 Feature Request
+description: Suggest an idea or feature for Baserow.
+labels: ["needs feedback ⚠️", "feature request 💡"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        If you have a vague idea or want feedback, please use the community forum first:
+        https://community.baserow.io/
+
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: Feature description
+      description: What is the desired new feature?
+    validations:
+      required: true
+
+  - type: textarea
+    id: examples
+    attributes:
+      label: Examples
+      description: Are there any examples of this feature in other software?

.github/PULL_REQUEST_TEMPLATE.md

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+### What is in this PR
+- E.g. a short explanation of what this pull request does.
+
+### How to test this PR
+- E.g. a short series of steps on how to test the features/bug fixes in this PR.
+
+### Checklist
+
+- [ ] A changelog entry has been added to `changelog/entries/unreleased` using `changelog/src/changelog.py`
+- [ ] New/updated **Premium/Enterprise features** are separated correctly in the premium or enterprise folder
+- [ ] The latest **Chrome and Firefox** have been used to test any new frontend features
+- [ ] [Documentation](https://github.com/baserow/baserow/blob/master/docs/index.md) has been updated
+- [ ] [Quality Standards](https://github.com/baserow/baserow/blob/master/CONTRIBUTING.md#quality-standards) are met
+- [ ] **Performance**: tables are still fast with 100k+ rows, 100+ field tables
+- [ ] The [redoc API pages](https://api.baserow.io/api/redoc/) have been updated for any REST API changes
+- [ ] Our [custom API docs](https://github.com/baserow/baserow/blob/master/web-frontend/modules/database/pages/APIDocsDatabase.vue) are updated for changes to endpoints accessed via API tokens
+- [ ] The UI/UX has been updated following the [UI Style Guide](https://baserow.io/style-guide)
+- [ ] Security impact of change has been considered