Add log searching

[everettraven]

The log panel is great for viewing the logs of a workload resource, but there is no way to look for log output that contains a specific substring. It would be useful to have a search mode that results in only showing log lines that contain a provided substring.

Acceptance Criteria:

• Key press triggers a search box that accepts a string to use to search logs
• Upon search term submission a new viewport is shown (and input to the logs panel viewport is disabled) that only shows logs that contain the searched substring
• Another key press, preferably a different key, should close the searched log mode and return to the log panel view
• (Optional): A nice to have would be to highlight the section of a log that matches the search term