Add configurable timeout and open_timeout options

[fellmirr]

⚠️ Pending clarification on CLA process by Railslove, sent an email

Add configurable timeout support

Some EBICS servers can be slow to respond, especially during batch processing or peak hours. This provides a clean way to configure timeouts without monkey-patching the connection method.

Adds optional timeout and open_timeout parameters to handle slow bank servers and unreliable network conditions.

• Passes values directly to Faraday's request options when specified
• Defaults to nil to maintain backward compatibility and use Faraday's defaults
• No new dependencies or breaking changes

Usage

client = Epics::Client.new(
  keys, passphrase, url, host, user, partner,
  timeout: 120,      # Request timeout in seconds (optional)
  open_timeout: 30   # Connection timeout in seconds (optional)
)

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