chore(meta): add issue templates

.github/ISSUE_TEMPLATE/BUG-FORM.yml

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+name: Bug report
+description: File a bug report
+type: Bug
+labels: ["T-bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please ensure that the bug has not already been filed in the issue tracker.
+
+        Thanks for taking the time to report this bug!
+  - type: checkboxes
+    attributes:
+      label: Have you ensured that foundryup is up to date?
+      options:
+        - label: "Yes"
+  - type: input
+    attributes:
+      label: What version of Foundryup are you on?
+      placeholder: "Run foundryup --version and paste the output here"
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: What command(s) is the bug in?
+      description: Leave empty if not relevant
+      placeholder: "For example: foundryup --install stable"
+  - type: dropdown
+    attributes:
+      label: Operating System
+      description: What operating system are you on?
+      options:
+        - Windows
+        - macOS (Intel)
+        - macOS (Apple Silicon)
+        - Linux
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the bug
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/FEATURE-FORM.yml

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+name: Feature request
+description: Suggest a feature
+type: Feature
+labels: ["T-feature"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please ensure that the feature has not already been requested in the issue tracker.
+
+        Thanks for helping us improve Foundryup!
+  - type: textarea
+    attributes:
+      label: Describe the feature you would like
+      description: Please also describe what the feature is aiming to solve, if relevant.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context to the feature (like screenshots, resources)

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+    - name: Support
+      url: https://t.me/foundry_support
+      about: This issue tracker is only for bugs and feature requests. Support is available on Telegram!