Add PEcAn type-level Sobol analysis workflow

[dlebauer]

Update or implement PEcAn type-level global sensitivity analysis for the major input types directly (e.g. param, poolinitcond, met, and events).

Scope:

• use existing PEcAn infrastructure for design to run mapping, config generation, output handling
• reuse (and update as needed) existing PEcAn functions as entry points, including generate_joint_ensemble_design(..., sobol = TRUE) and
  compute_sobol_indices().
• generate type-level designs over four types
• support row-based sampling from joint posterior parameter draws to capture covariance; (do not use quantile sampling because it does not preserve covariance structure)
• run PEcAn and save type-level sensitivity outputs for later plotting / reporting: CSV with direct type-level S and T
• compare one test case against the current CCMMF parameter-level workflow

Notes:

• goal is a workflow that leverages PEcAn functions
• current Sobol implementation may be reused where helpful, but should not constrain the fastest path to a correct workflow

[dlebauer]

implemented in and waiting on PecanProject/pecan#3893