[Feature]: Sampling options for the validation workflow

[calebrob6]

Problem Statement

(came up during sprint readout)

We should have the option to changing sampling type (potentially stratifying over the different predicted classes -- this will help in the situation where we have few damaged buildings) and number of sampled buildings.

Proposed Solution

Editable ImageLayer level options for validation sampling strategies

Alternatives Considered

No response

Area

Other

Additional Context

No response

Checklist

• I have searched existing issues and this has not already been requested.