RFC: Parameters utility

[saragerion]

### Tasks
- [ ] #1173
- [ ] #1175 
- [ ] #1176
- [ ] #1177 
- [ ] #1174 
- [ ] #1035 
- [ ] #1034 
- [ ] #1041 
- [ ] #1172 
- [ ] #1036 
- [ ] #1037 
- [ ] #1039
- [ ] #1042 
- [ ] #1043 
- [ ] #1040

Key information

• RFC PR: (leave this empty)
• Related issue(s), if known:
• • Maintenance: move redundant code and functionalities in shared commons package #484
• • Maintenance: undefined environment variable returning empty string from EnvironmentVariablesService #165
• Area: Parameters
• Meet tenets: Yes
• Approved by: ''
• Reviewed by: ''

Summary

Implementation/porting of a Parameters utility already implemented in Python.

Motivation

Features parity across Powertools languages, prioritized based on community demand.

I am keeping the sections below empty for now to allow us to think it throught, but I am keen on hearing our community's ideas, wishlists, desired UX, etc.

Proposal

User Experience

Drawbacks

Rationale and alternatives

Unresolved questions

[dreamorosi]

Just for info purposes, there is a development branch that I started about 10 months ago with an initial implementation of the utility that matches the Python version of the time, plus unit tests.

As I mentioned I haven't been working on this for a long while, I have just rebased today to incorporate the current project structure. Maybe this can be used as a PoC reference for a future implementation. In case we want to go in a different direction I'm also happy to discard it.

[dreamorosi]

The first public beta for the utility has been released in v1.7.0 (@aws-lambda-powertools/parameters@1.7.0-beta on npm).

We are eager to hear your feedback, so feel free to open an issue if you encounter any bug or open a discussion here or on Discord if you have questions or doubts.

[github-actions]

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