Add bug/enhancement instrgen issue templates (#3678)

* Add bug/enhancement instrgen issue templates

The Go instrumentation team need a way to tag issues related to
instrgen. Given they don't currently have write access to the repository
and would need it to add the label themselves, this is a solution that
allows for these issues to be created without modifying permissions.

A follow up PR is planed to add a similar template for all other "area" labels.

* Fix typo

.github/ISSUE_TEMPLATE/bug_report_instrgen.md

@@ -0,0 +1,29 @@
+---
+name: '[instrgen] Bug report'
+about: Create a report of invalid behavior about the instrgen package to help us improve
+title: ''
+labels: 'bug, area: instrgen'
+assignees: '@open-telemetry/go-instrumentation-approvers'
+
+---
+
+### Description
+
+A clear and concise description of what the bug is.
+
+### Environment
+
+- OS: [e.g. iOS]
+- Architecture: [e.g. x86, i386]
+- Go Version: [e.g. 1.15]
+- `instrgen` version: [e.g. v0.14.0, 3c7face]
+
+### Steps To Reproduce
+
+1. Using this code ...
+2. Run ...
+3. See error ...
+
+### Expected behavior
+
+A clear and concise description of what you expected to happen.

.github/ISSUE_TEMPLATE/feature_request_instrgen.md

@@ -0,0 +1,30 @@
+---
+name: '[instrgen] Feature request'
+about: Suggest an idea for the instrgen package
+title: ''
+labels: enhancement
+labels: 'enhancement, area: instrgen'
+assignees: '@open-telemetry/go-instrumentation-approvers'
+
+---
+
+### Problem Statement
+
+A clear and concise description of what the problem is.
+Ex. I'm always frustrated when [...]
+
+### Proposed Solution
+
+A clear and concise description of what you want to happen.
+
+#### Alternatives
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+#### Prior Art
+
+A clear and concise list of any similar and existing solutions from other projects that provide context to possible solutions.
+
+### Additional Context
+
+Add any other context or screenshots about the feature request here.