Add Swift example for managing NFT allowances

[b-l-u-e]

Description:

By adding an example to demonstrate how to manage NFT allowances in the Swift SDK.

The example includes step-by-step processes for:

• Setting up the SDK client with the necessary operator account and key.
• Creating a unique NFT and minting tokens with metadata.
• Creating spender and receiver accounts.
• Associating spender and receiver accounts with the NFT.
• Granting allowance for specific NFT serials to a spender account.
• Executing an NFT transfer using the approved allowance.
• Revoking the allowance for certain NFT serials.
• Attempting a transfer after revocation to confirm permission removal.
• Cleaning up resources by deleting tokens and accounts.

Testing:

• Due to not having access to a macOS or iOS environment, I am unable to run the example locally.
• I have followed the requirements and provided the steps as per the Swift SDK documentation.
• I request assistance from the maintainers or anyone with access to a macOS environment to test this example and verify that it functions as expected.

Related issue(s):

Fixes #385: Add example: Add and remove NFT allowances

Notes for reviewer:

Checklist

• Documented (Code comments,)
• Tested (unit, integration, etc.)

[b-l-u-e]

Requesting for assistance on testing this one @hendrikebbers

[b-l-u-e]

Hello need help with testing. Anyone please @kenthejr @dalvizu @mehcode

[RickyLB]

Hello need help with testing. Anyone please @kenthejr @dalvizu @mehcode

Hi @b-l-u-e, thank you for your PR.

In Package.swift, add AddNftAllowance to the list of exampleTargets so the SDK detects the executable. Then run swift run AddNftAllowanceExample in the terminal.

Note: Run task format to pass the CI format check

[b-l-u-e]

@RickyLB thank you for reaching out to me.. let me add AddNftAllowance in exampleTargets

[b-l-u-e]

@RickyLB just made changes

[b-l-u-e]

@RickyLB @mehcode @dalvizu @kenthejr requesting for a review.

[RickyLB]

@b-l-u-e

A good way to test the example would be to create a testnet account in hedera portal account, and fill a new .env file in the SDK with the following ECDSA values from portal:

OPERATOR_ID=<Account Id>
# Default private key to use to sign for all transactions and queries
OPERATOR_KEY=<DER Encoded Private Key>

# Network names: `"localhost"`, `"testnet"`, `"previewnet"`, `"mainnet"`
HEDERA_NETWORK=testnet

Apologize, I should have included this earlier to help you with testing your example.

[b-l-u-e]

@RickyLB requesting for a review made some changes based on your review

[b-l-u-e]

@RickyLB any updates?

[RickyLB]

@b-l-u-e please check the CI build errors; they will tell you why it's failing. Also, it may help to install Swift 6.0.2 on your local machine (Windows or linux) so you can view these errors quicker.

[sonarcloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[RickyLB]

LGTM. Merging!