Convert GH Issue template to YML files (#669)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Create a report to help us improve
+body:
+- type: input
+  attributes:
+    label: Braintree SDK Version
+    placeholder: "e.g. 4.24.0"
+  validations:
+    required: true
+- type: dropdown
+  attributes:
+    label: Environment
+    options:
+      - Sandbox
+      - Production
+      - Both
+  validations:
+    required: true
+- type: input
+  attributes:
+    label: Android Version & Device
+    placeholder: "e.g Google Pixel 6a - Android 12.0"
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Braintree dependencies
+    placeholder: |
+      <!-- Examples -->
+      <!--  - com.braintreepayments.api:braintree:x.y.z -->
+      <!--  - compile 'com.braintreepayments.api:data-collector:2.+' -->
+      <!--  - com.braintreepayments.api:visa-checkout:x.y.z-SNAPSHOT -->
+      <!--  - com.braintreepayments.api:drop-in:x.y.z -->
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Describe the bug
+    description: Description of what the bug is. Please include as many details as possible.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: To reproduce
+    description: Steps to reproduce the behavior.
+    placeholder: |
+      1. Go to '...'
+      2. Click on '....'
+      3. See error
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Expected behavior
+    description: Description of what you expected to happen.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Screenshots
+    description: If applicable, add screenshots to help explain your problem.
+    placeholder: |
+      Do not reveal sensitive data. For example, credit card numbers & customer credentials.
+  validations:
+    required: false
+- type: markdown
+  attributes:
+    value: |
+      Note - Please do not open an issue for translation requests for new languages. We support the same languages that are supported by PayPal, and have a dedicated localization team to provide translations. If there is an error in a specific translation, you may open an issue here and we will escalate it to our localization team.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea for our SDK
+body:
+- type: textarea
+  attributes:
+    label: Is your feature request related to a problem? Please describe.
+    description: A clear and concise description of what the problem is.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Describe the solution you'd like.
+    description: Description of what you want to happen.
+    placeholder: |
+      Follow the [user story](https://en.wikipedia.org/wiki/User_story) format to clearly describe the use case.
+  validations:
+    required: false