feat(iota): add default envs to new client.yaml

[Alex6323]

Description of change

Includes default envs { localnet, devnet, testnet, mainnet } in a newly created client.yaml config file to improve UX.

Links to any relevant issues

Fixes #7818

How the change has been tested

• Basic tests (linting, compilation, formatting, unit/integration tests)
• Patch-specific tests (correctness, functionality coverage)
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

Additionally verified the changes with the following commands:

cargo run --package iota --bin iota client new-env --alias my-network --rpc https://api.devnet.iota.cafe --graphql https://graphql.devnet.iota.cafe

RUST_LOG=warn cargo run --package iota --bin iota client --yes new-env --alias testnet --rpc https://api.devnet.iota.cafe --graphql https://graphql.devnet.iota.cafe

cargo run --package iota --bin iota client envs

Release Notes

• Protocol:
• Nodes (Validators and Full nodes):
• Indexer:
• JSON-RPC:
• GraphQL:
• CLI: add default network environments { mainnet, testnet, devnet, localnet } to client.yaml
• Rust SDK:
• REST API:

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[Thoralf-M]

Please also update the release notes