Feature: Improve transaction feedback

[L03TJ3]

Description

• - add global sign-tx modal (what is now used scoped in claim-button)
• - make global sign modal props/styling customizable
• - replace local sign modal in claim-flow with global sign modal

About # (link your issue here)
#79
GoodDollar/GoodProtocolUI#417

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Checklist:

• PR title matches follow: (Feature|Bug|Chore) Task Name
• My code follows the style guidelines of this project
• I have followed all the instructions described in the initial task (check Definitions of Done)
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have added reference to a related issue in the repository
• I have added a detailed description of the changes proposed in the pull request. I am as descriptive as possible, assisting reviewers as much as possible.
• I have added screenshots related to my pull request (for frontend tasks)
• I have pasted a gif showing the feature.
• @mentions of the person or team responsible for reviewing proposed changes