DEMO: pay with FT

[anthony-near]

Similar to https://github.com/orgs/near/projects/98/views/2?pane=issue&itemId=40377976 but using a pay with FT config https://github.com/near/pagoda-relayer-rs/blob/feature/example_configs/examples/configs/pay_with_ft.toml

Tasks

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1. Create a testnet FT that can be used to pay fees, is mintable, and is burnable: https://github.com/anthony-near/relayer-fee-token
2. include shared storage logic bsaed on https://github.com/NearSocial/social-db/blob/master/contract/src/shared_storage.rs in relayer-fee-token contract

[anthony-near]

Create a testnet FT that can be used to pay fees, is mintable, and is burnable: https://github.com/anthony-near/relayer-fee-token