Improve performance of text searching

[adam-wolfe]

Is your feature or enhancement request related to a problem or limitation? Please describe

The current search implementation works well for smaller numbers of members/data sets but can be slow for searching through larger PDSs.

Describe your enhancement idea

We should investigate and decide on a searching method that improves performance (possibly by invoking SuperC via JCL/TSO/REXX or by using dgrep from ZOAU). This may need to be an opt-in feature if there are concerns about availability of ZOAU or other software or if the functionality requires additional configuration properties.

Describe alternatives you've considered

Provide any additional context

Some options may require the user to add information to their config (such as specifying a job statement or placing a Rexx script somewhere on the mainframe).

[github-actions]

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