Add `fglatch set-workspace` tool

[msto]

Summary

This tool should accept a single argument, a workspace ID or name.

If the argument is numeric (str.isdigit()), assume it is a workspace ID. Otherwise, assume it is a workspace name (or substring), and search for the (lowercased) name in the available workspaces.

Use user_config.update_workspace() to set the workspace.
https://github.com/latchbio/latch/blob/e0e83673bb418f03d6e221acb4ae7ae829d8f8e9/src/latch_cli/services/workspace.py#L42

Use latch.utils.get_workspaces() to get the available workspaces. (It returns a mapping of workspace IDs to workspace names)
https://github.com/latchbio/latch/blob/e0e83673bb418f03d6e221acb4ae7ae829d8f8e9/src/latch_cli/services/register/register.py#L385

If the provided argument is not an exact match for a workspace ID or a fuzzy match for a workspace name, raise an error.