Support Load Reporter

[Polkas]

connected with https://github.com/insightsengineering/teal.reporter/pull/251

My work is done as a collaboration of UCB company with Roche. insightengineering developers can edit this PR.

Objective: Support the Load Report functionality for TealRerportCard and TealSliceBlock

• Update the to_list and from_list TealSliceBlock methods. They operate on a string output.
• Export TealSliceBlock which is needed for the teal.reporter ReportCard.
• set_id for the Reporter so we protect that it can be reloaded only for the same teal app.
• Fix the wrong docs.

[github-actions[bot]]

CLA Assistant Lite bot ✅ All contributors have signed the CLA

[Polkas]

I have read the CLA Document and I hereby sign the CLA

[gogonzo]

@Polkas could you please merge main to this branch. There are some changes in teal which are important in this context

[Polkas]

@gogonzo done:)

[gogonzo]

@Polkas we need to overcome some cicd issues. You will be able to merge soon 💪

[Polkas]

We need to merge the teal.reporter PR first.