kunit: Enable direct registration of parameter arrays to a KUnit test

KUnit parameterized tests currently support two primary methods f
or getting parameters:
1.  Defining custom logic within a generate_params() function.
2.  Using the KUNIT_ARRAY_PARAM() and KUNIT_ARRAY_PARAM_DESC()
    macros with a pre-defined static array and passing
    the created *_gen_params() to KUNIT_CASE_PARAM().

These methods present limitations when dealing with dynamically
generated parameter arrays, or in scenarios where populating parameters
sequentially via generate_params() is inefficient or overly complex.

This patch addresses these limitations by adding a new `params_array`
field to `struct kunit`, of the type `kunit_params`. The
`struct kunit_params` is designed to store the parameter array itself,
along with essential metadata including the parameter count, parameter
size, and a get_description() function for providing custom descriptions
for individual parameters.

The `params_array` field can be populated by calling the new
kunit_register_params_array() macro from within a param_init() function.
This will register the array as part of the parameterized test context.
The user will then need to pass kunit_array_gen_params() to the
KUNIT_CASE_PARAM_WITH_INIT() macro as the generator function, if not
providing their own. kunit_array_gen_params() is a KUnit helper that will
use the registered array to generate parameters.

The arrays passed to KUNIT_ARRAY_PARAM(,DESC) will also be registered to
the parameterized test context for consistency as well as for higher
availability of the parameter count that will be used for outputting a KTAP
test plan for a parameterized test.

This modification provides greater flexibility to the KUnit framework,
allowing  testers to easily register and utilize both dynamic and static
parameter arrays.

Link: https://lore.kernel.org/r/20250826091341.1427123-5-davidgow@google.com
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Rae Moar <rmoar@google.com>
Signed-off-by: Marie Zhussupova <marievic@google.com>
[Only output the test plan if using kunit_array_gen_params --David]
Signed-off-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

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