Update issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report to help us reproduce and correct the bug
+labels: ["bug", "needs triage"]
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      #### Before submitting a bug, please make sure the issue hasn't been already
+      addressed by searching through [the past issues](https://github.com/IFCA/frouros/issues).
+- type: textarea
+  attributes:
+    label: Describe the bug
+    description: >
+      A clear and concise description of what the bug is.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Steps/Code to Reproduce
+    description: |
+      Please add a minimal code example that can reproduce the error when running it. Be as succinct as possible, **do not depend on external data files**: instead you can generate synthetic data using `numpy.random`, [frouros.datasets](https://frouros.readthedocs.io/en/stable/api_reference/datasets.html) or a few lines of Python code. Example:
+
+      ```python
+      from frouros.detectors.data_drift.streaming import MMD
+      import numpy as np
+
+      np.random.seed(seed=31)
+      group_A = np.random.normal(loc=1, scale=1, size=1000)
+      group_B = np.concatenate(
+          [
+              np.random.normal(loc=1, scale=1, size=1000),
+              np.random.normal(loc=5, scale=0.1, size=1000),
+          ],
+      )
+      detector = MMD(
+        chunk_size=100,
+      )
+      ```
+    placeholder: |
+      ```
+      Sample code to reproduce the problem
+      ```
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Expected Results
+    description: >
+      Please paste or describe the expected results.
+    placeholder: >
+      Example: No error is thrown.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Actual Results
+    description: |
+      Please paste or describe the results you observe instead of the expected results. If you observe an error, please paste the error message including the **full traceback** of the exception. For instance the code above raises the following exception:
+      ```python-traceback
+      ---------------------------------------------------------------------------
+      Traceback (most recent call last)
+        File "/frouros/mmd.py", line 12, in <module>
+          detector = MMD(
+      TypeError: __init__() missing 1 required positional argument: 'window_size'
+      ```
+    placeholder: >
+      Please paste or specifically describe the actual output or traceback.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Versions
+    render: shell
+    description: |
+      Please run the following and paste the output below.
+      ```python
+      from importlib.metadata import version; version("frouros")
+      ```
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉! We will review your bug report as soon as possible.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a new algorithm, enhancement to an existing algorithm, etc.
+labels: ["enhancement", "needs triage"]
+
+body:
+- type: textarea
+  attributes:
+    label: Describe the workflow you want to enable
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Describe your proposed solution
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Describe alternatives you've considered, if relevant
+- type: textarea
+  attributes:
+    label: Additional context
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉! We will review your proposal as soon as possible.