Solution 2 Prototype where shared string talks to attributor rather than App.

[jatgarg]

Description

Attribution means who inserted/annotated the text and at what time. Currently FF only supports attribution for the text and attribution for the props in the shared string. This means that the App can only get info about the user Id and the time at which a text is inserted/annotated like bold/italic or any other prop. We don’t allow app to store any other attribution data related to piece of text. For example,

1.) App wants to add a prop called DataSource which tells whether the source of text was from a template or not (called DataSource attribution prop on shared string).

2.) For copy paste scenario, where the user could be anyone outside the users of doc/org or even inside the doc, we need to let the app insert that custom attribution info which cannot be extracted from the op.

3.) Some copilot attribution props like “onBehalfOf” etc which tells us the user on behald of whom the text was inserted by the copilot.

Solution 1 is here: https://github.com/microsoft/FluidFramework/pull/21882

### I have not implemented Attributor as iFluidDataStoreChannel yet, as that is orthogonal to how shared string will use it. This PR is for demonstrating the changes which will be required in the shared string.

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