Enhance the encoder/decoder tests to allow testing with a non-default library context and configurable providers

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dal

Enhance the encoder/decoder tests to allow testing with a non-default library context and configurable providers

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14587)

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