Consider adding more "secret" params to WF API

[philipmac]

It may be useful to allow extra functionality / arguments / control to be injected into the WFs to help debugging, tune per run optimizations, etc.

For example:
log level: bool,
bioformats chunk size: int,
ng_shader_param_quantiles: [float, float]
rechunk_in_memory: bool

[blowekamp]

Note common logging systems use "[DEBUG|INFO|WARNING|ERROR]" for logging levels.

[annshress]

Maybe, we can load them from .env file. Currently we have them already setup.

Passing these variables into functions during the testing phase to be able to test and tune parameters sounds good.

[philipmac]

We could make current "secret" params clearer.

[philipmac]

prefix any param that is not for public use is prefixed with x_

note - if the param is exposed at some later point, the x_ can be removed, the param can remain unchanged and now be "public"

[annshress]

This is inspired by HTTP experimental or non-standard/custom headers.

In HTTP headers, the "X-" prefix is often used to denote non-standard or custom headers. Standard HTTP headers are defined by specifications like those outlined in the HTTP/1.1 RFCs (Request for Comments). However, developers and organizations may introduce custom headers for specific purposes.
The "X-" prefix indicates that a particular header is an extension or experimental header that is not part of the official HTTP specification. This naming convention helps prevent clashes with future standard headers that might be introduced in subsequent HTTP versions.