Implement OSSL_PROVIDER_get0_default_search_path, add docs and tests.

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://git

Implement OSSL_PROVIDER_get0_default_search_path, add docs and tests.

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19752)

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