improv: github issues template, RFC added (#572)

* improv: github issues template, RFC added

* fix: RFC title

* improv: github issues titles consistency

Author: saragerion

Diff for: .github/ISSUE_TEMPLATE/BUG_REPORT.md

@@ -1,7 +1,7 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-title: "(module name): short issue description"
+title: "Bug (module name): short issue description"
 labels: bug, triage
 ---
 

Diff for: .github/ISSUE_TEMPLATE/DOC_IMPROVEMENT.md

@@ -1,7 +1,7 @@
 ---
 name: Documentation improvement
 about: Suggest a documentation update, improvement
-title: "(module name): short issue description"
+title: "Documentation (module name): short issue description"
 labels: documentation
 ---
 

Diff for: .github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

@@ -1,7 +1,7 @@
 ---
 name: Feature request
 about: Suggest an idea for this project
-title: "(module name): short issue description"
+title: "Feature (module name): short issue description"
 labels: feature-request, triage
 ---
 

Diff for: .github/ISSUE_TEMPLATE/RFC.md

@@ -0,0 +1,71 @@
+---
+name: RFC
+about: Feature design and proposals
+title: 'RFC (module name): short issue description'
+labels: RFC, triage
+assignees: ''
+approved by: ''
+---
+
+## Key information
+
+* RFC PR: (leave this empty)
+* Related issue(s), if known:
+* Area: (i.e. Tracer, Metrics, Logger, etc.)
+* Meet [tenets](https://awslabs.github.io/aws-lambda-powertools-typescript/latest/#tenets): (Yes/no)
+* Approved by: ''
+* Reviewed by: ''
+
+## Summary
+[summary]: #summary
+
+<!--- One paragraph explanation of the feature. -->
+
+## Motivation
+[motivation]: #motivation
+<!--- Why are we doing this? What use cases does it support? What is the expected outcome? -->
+
+
+## Proposal
+[proposal]: #proposal
+
+<!--- This is the bulk of the RFC. -->
+<!--- Explain the design in enough detail for somebody familiar with Powertools to understand it, and for somebody familiar with the implementation to implement it. -->
+
+
+<!--- If this feature should be available in other runtimes (e.g. Java, Typescript), how would this look like to ensure consistency? -->
+
+
+## User Experience
+
+<!--- How would customers use it? -->
+
+
+<!--- Any configuration or corner cases you'd expect? -->
+
+
+<!--- Demonstration of before and after on how the experience will be better -->
+
+
+## Drawbacks
+[drawbacks]: #drawbacks
+
+<!--- Why should we *not* do this? -->
+
+
+<!--- Do we need additional dependencies? Impact performance/package size? -->
+
+
+## Rationale and alternatives
+[rationale-and-alternatives]: #rationale-and-alternatives
+
+<!--- What other designs have been considered? Why not them? -->
+
+
+<!--- What is the impact of not doing this? -->
+
+
+## Unresolved questions
+[unresolved-questions]: #unresolved-questions
+
+<!--- Optional, stash area for topics that need further development e.g. TBD  -->