feat(examples/oft-solana): introduce getSolanaDeploymentFunction

[nazreen]

Motivation

Solana deployments should have a similar devex compared to what is achieved through hardhat-deploy, which is that the deployment values (account addresses) should be auto retrieved and not need manual passing via params.

This PR

• introduces a getSolanaDeploymentFunction which reads the existing OFT.json under deployments
• using the new function, obtain the necessary values from the OFT.json, removing the need to manually pass in values such as Solana program ID and mint address

Impact

We get to simplify solana tasks/commands, with the most drastic change being the send (from Solana) script,

from:

npx hardhat lz:oft:solana:send --amount 1000000000 --from-eid 40168 --to $EVM_ADDY --to-eid 40161 --mint <MINT_ADDRESS> --program-id <PROGRAM_ID> --escrow <ESCROW>

to:

npx hardhat lz:oft:solana:send --amount 1000000000 --from-eid 40168 --to $EVM_ADDY --to-eid 40161

Testing

To test, run:

LAYERZERO_EXAMPLES_REPOSITORY_REF=#nazreen/oft-solana-read-prog-id LZ_ENABLE_SOLANA_OFT_EXAMPLE=1 npx create-lz-oapp@latest

Select OFT (Solana)

Proceed as usual; refer to the README diff to see which commands are now simplified.