feat/get-profile-by-anchor

[armaanansari121]

feat: get_profile_by_anchor

Implemented get_profile_by_anchor function.
Mapping anchor_to_profile_id

Let me know if anything else needs to be changed.

Fixes #14

[Akashneelesh]

@armaanansari121 Please comment under the issue and only pick it up ones you've been assigned to issue. And avoid redundant PR raise for the same issue. Please fix the issue -> do scarb fmt before raising PR and fix the error while trying to do snforge test

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