Configurable workspace selection and compilation retries

[LukeA12]

This PR adds two new features to MaxKernel:

1. It allows the user to ask MaxKernel to set a working directory. Previously MaxKernel defaulted to only working out of the accelerator-agents/MaxKernel directory, which limited it's ability to read and write to kernel files located in other directories. In my testing, this was an inconvenience because I would have to manually copy the optimized kernel over to the directory I wanted to work from when MaxKernel was finished. Now the user can simply ask MaxKernel to work in a specified directory and it will do so; no manual copying needed. I verified this worked in the MaxKernel UI:

2. It also allows the user to configure the max number of retries MaxKernel works through a compilation error. Currently this is set to 4 for the hitl_agent and 6 for the auto_agent. In my testing, I found that four iterations was fine when asking it to make incremental commits with clear direction, but it was too restrictive when giving it a larger goal of fully optimizing a kernel in which significant code changes might be required. When I asked it to do this, it almost always hit the 4 iteration limit which blocked further progress. For this reason, I have incremented the default iteration limit for the hitl_agent to be 6 (matching the auto_agent) and also added the ability for the user to request this limit be changed if needed. I verified this worked by testing in the MaxKernel UI:

[NinaCai]

Thank you Luke for this PR! I left a few comments.