feat: InPlayer register flow

[kiremitrov123]

Description

With this PR, InPlayer register flow is almost completed. It includes changes in pretty much all of the methods that are required for this flow, except the favourites and history. This is what will follow in the next PR.

Updates are mostly in the AccountController.tsx, cleeng.account.service.ts and inplayer.account.service.ts.

No visual changes.

Steps completed:

According to our definition of done, I have completed the following steps:

• Acceptance criteria met
• Unit tests added
• Docs updated (including config and env variables)
• Translations added
• UX tested
• Browsers / platforms tested
• Rebased & ready to merge without conflicts
• Reviewed own code

[github-actions]

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