Fix post 606 by switching supervisor from AccountId to String in Sponsorship

When trying to get post 606

near contract \
    call-function \
    as-read-only devgovgigs.near get_post \
    json-args '{"post_id": 606}' \
    network-config pagoda-mainnet \
    now

The error occurs:

Error: 
   0: Failed to fetch query for view method: 'get_post' (contract <devgovgigs.near> on network <mainnet>)
   1: Failed to make a view-function call
   2: handler error: [Function call returned an error: wasm execution failed with error: HostError(GuestPanic { panic_msg: "Cannot deserialize element" })]

Note: add_post transaction

Here is why:

This PR updates near-sdk-rs from version 3.1.0 to version 4.1.1 https://github.com/NEAR-DevHub/neardevhub-contract/commit/b06629b7694a05c12e7bd4ba570113b12dde073e
near-sdk-rs version 3.1.0 uses near-primitives-core version 0.4.0 where AccountId is defined as a string
In near-sdk-rs 4.1.1 AccountId became a type with checks if account is valid

So before the change it was possible to add a post with empty supervisor:

near contract \                        
    call-function \
    as-transaction test_606_from_9829f4.testnet add_post \
    json-args '{
  "body": {
    "name": "Kyiv Tech Summit 2023: Web3 Hackathon+Conference",
    "amount": "30000",
    "post_type": "Sponsorship",
    "supervisor": "",         
    "description": "sponsorship on old version without supervisor",
    "sponsorship_token": "USD",
    "sponsorship_version": "V1"
  },
  "labels": [
    "hackathon"
  ]
}' \
    prepaid-gas '300 Tgas' \
    attached-deposit '0.1 NEAR' \
    sign-as test_606_from_9829f4.testnet  \
    network-config testnet \
    sign-with-keychain \
    send

After the change, it became invalid

So, in this PR supervisor field's type is changed from AccountId to simple String. So that there is no type check. It does not break anything. And I don't provide migration as Sponsorship is deprecated

Summary by CodeRabbit

Refactor
- Updated the supervisor field in sponsorship-related features from an account ID to a string for enhanced flexibility and usability.

Walkthrough

The recent update involves modifying the data type of the supervisor field in the Sponsorship and SponsorshipV1 structs from AccountId to String. This change simplifies the representation of supervisor identities, potentially enhancing flexibility and ease of integration in diverse environments.

Changes

File Path	Change Summary
`.../post/sponsorship.rs`	Changed `supervisor` field type from `AccountId` to `String` in `Sponsorship` and `SponsorshipV1` structs.

🐇🌟 In the code where bytes once stood, Strings now flow, as they should. A rabbit hopped through fields so wide, Changing IDs with a joyful stride. Hop, skip, a code flip—how grand! A simpler trace through data's land. 🌼🚀

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NEAR-DevHub / neardevhub-contract