feat: add "iapp chain select" command

[PierreJeanjacquot]

changes

add iapp chain select <name> command to update the project default chain

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[Copilot]

Pull request overview

Adds a new CLI subcommand to set the project’s defaultChain in iapp.config.json, along with tests to validate config defaults and the new selection behavior.

Changes:

• Add iapp chain select <chainName> command wired into the yargs CLI.
• Implement chainSelect command to update defaultChain in the project config (after locating project root).
• Extend CLI tests with config-reading helper and new chain select test cases.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
cli/test/test-utils.ts	Adds readIAppConfig(projectDir) helper to read iapp.config.json from tests.
cli/test/iapp.test.ts	Adds assertions for init-generated config defaults and adds chain select tests.
cli/src/index.ts	Registers new chain select command with SUPPORTED_CHAINS choices.
cli/src/cmd/chain-select.ts	Implements command logic to update and persist defaultChain in config.

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