Add NID constants for Brainpool curves

Brainpool curves are used by European government organizations that are
suspicious of the NIST curves. Brainpool curves are very similar to NIST
curves with one critical difference: the parameters to Brainpool are
nothing-up-my-sleeve numbers [0].

The actual values of the NID constants have been taken from the OpenSSL
source code [1].

[0]: https://github.com/veorq/numsgen#seeds

[1]: https://github.com/openssl/openssl/blob/4e6647506331fc3b3ef5b23e5dbe188279ddd575/include/openssl/obj_mac.h#L4759