Github: Add issue form (apache#4867)

.github/ISSUE_TEMPLATE/iceberg_bug_report.yml

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+---
+name: Iceberg Bug report 🐞
+description: Problems, bugs and issues with Apache Iceberg
+labels: ["kind:bug"]
+body:
+  - type: dropdown
+    attributes:
+      label: Apache Iceberg version
+      description: What Apache Iceberg version are you using?
+      multiple: false
+      options:
+        - "0.14.0 (latest release)"
+        - "0.13.1"
+        - "0.13.0"
+        - "0.12.1"
+        - "0.12.0"
+        - "0.11.1"
+        - "0.11.0"
+        - "main (development)"
+    validations:
+      required: false
+  - type: dropdown
+    attributes:
+      label: Query engine
+      description: Which query engine?
+      multiple: false
+      options:
+        - Spark
+        - Trino
+        - Starburst
+        - Snowflake
+        - Dremio
+        - Starrocks
+        - Doris
+        - EMR
+        - Athena
+        - PrestoDB
+        - Flink
+        - Impala
+        - Hive
+        - Other
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Please describe the bug 🐞
+      description: >
+        Please describe the problem, what to expect, and how to reproduce.
+        Feel free to include stacktraces and the Iceberg catalog configuration.
+        You can include files by dragging and dropping them here.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/iceberg_improvement.yml

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+---
+name: Iceberg Improvement / Feature Request
+description: New features with Apache Iceberg
+labels: ["kind:feature request"]
+body:
+  - type: textarea
+    attributes:
+      label: Feature Request / Improvement
+      description: Please describe the feature and elaborate on the use case and motivation behind it
+    validations:
+      required: true
+  - type: dropdown
+    attributes:
+      label: Query engine
+      description: Which query engine?
+      multiple: false
+      options:
+        - Spark
+        - Trino
+        - Starburst
+        - Snowflake
+        - Dremio
+        - Starrocks
+        - Doris
+        - EMR
+        - Athena
+        - PrestoDB
+        - Flink
+        - Impala
+        - Hive
+        - Other
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/iceberg_question.yml

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+---
+name: Iceberg Question
+description: Questions around Apache Iceberg
+labels: ["kind:question"]
+body:
+  - type: markdown
+    attributes:
+      value: "Feel free to ask your question on [Slack](https://join.slack.com/t/apache-iceberg/shared_invite/zt-tlv0zjz6-jGJEkHfb1~heMCJA3Uycrg) as well."
+  - type: textarea
+    attributes:
+      label: Query engine
+      description: Which query engine (Flink, Spark, EMR, etc) are you using?
+  - type: textarea
+    attributes:
+      label: Question
+      description: What is your question?
+    validations:
+      required: true