fix: remove unsupported map extension

[Jakub-Vacek]

Description

This PR removes .suma extension from map file resolution. I am not happy with this part of code and I suggest resolving: https://github.com/superfaceai/one-sdk-js/issues/279 to fix it. But now (for 2.0.0) I don't want to change this (critical) part of code. So I just removed extension that is not supported.

Motivation and Context

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have updated the documentation accordingly. If you are changing code related to user secrets you need to really make sure that security documentation is correct.
• [x] I have read the CONTRIBUTING document.
• [x] I haven't repeated the code. (DRY)
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[Jakub-Vacek]

👍 simple change, but not easy to understand from code 😅

Yep, we really need to refactor this. I will try to find some time next week to do it :)