AzeroID off-chain resolver implementation

[realnimish]

Usage example:

Installation:
Run the following command from the root directory

yarn && yarn build

Start the gateway server:

1. Set appropriate TLDs and their target registry in ./packages/gateway/src/supported-tlds.json (optional)
2. Run the following command from root directory

yarn start:gateway \
--private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 \
--provider-url wss://ws.test.azero.dev

Deploy OffchainResolver (one time only):

1. cd packages/contracts/
2. Set the env variables (for more info checkout contracts/README#Deployment Instructions)

export DEPLOYER_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
export SIGNER_ADDR=0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266

3. Execute ./deploy.sh (by default deploys on Sepolia; customisable by NETWORK env variable)
4. Note down the contract address and set your ENS domain resolver to it.

[wottpal]

Can you please add a concrete usage example in the PR description or README?