Add `--timeout` option to the CLI

[andersy005]

Currently, when parsing the log file for Jupyter server information we use a while loop with a naive condition

jupyter-forward/jupyter_forward/core.py

Lines 209 to 215 in 917c142

	):
	pattern = 'is running at:'
	while condition:
	try:
	result = self.run_command(f'cat {self.log_file}', echo=False, hide='out')
	if pattern in result.stdout:
	condition = False

This loop can easily turn into an infinite loop when something goes wrong and the log file is not found or empty. We should probably add a timeout option to the RemoteRunner class plus the CLI to allow users to configure how long we should wait before exiting the while loop.

[kmpaul]

Nice catch!