Update issue templates (#235)

* Update issue templates

* Update feature-request.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve lighteval!
+title: "[BUG] "
+labels: bug
+assignees: ''
+
+---
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## To Reproduce
+Please provide all the steps needed to reproduce the behavior, or provide a minimal working example if needed. We will ignore issues missing this section.
+
+## Expected behavior
+A clear and concise description of what you expected to happen.
+
+## Version info
+Please provide your operating system, lighteval version or commit if you installed from main, and pip/conda environment if your problem concerns dependencies.

.github/ISSUE_TEMPLATE/evaluation-task-request.md

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+---
+name: Evaluation/task request
+about: Suggest a new evaluation you want us to add
+title: "[EVAL]"
+labels: new task
+assignees: ''
+
+---
+
+## Evaluation short description
+- Why is this evaluation interesting?
+- How used is it in the community?
+
+## Evaluation metadata
+Provide all available
+- Paper url: 
+- Github url: 
+- Dataset url:

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FT] "
+labels: feature request
+assignees: ''
+
+---
+
+## Issue encountered
+Is your feature request related to a problem? Please provide a clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Solution/Feature
+A clear and concise description of what you want to happen.
+
+## Posssible alternatives
+A clear and concise description of any alternative solutions or features you've considered.
+