Select session, RSA OAEP and PQC template hash algorithms via _ex wrappers

[aidangarske]

Description

• Add _ex wrapper so callers can easily pick hash algo instead of hard coded sha-256
• Session/policy: wolfTPM2_StartSession_ex, wolfTPM2_CreateAuthSession_EkPolicy_ex (adds authHash) — the original ask, so encrypted SHA-512
  policy sessions match
• RSA: wolfTPM2_RsaEncrypt_ex / RsaDecrypt_ex (adds OAEP hashAlg)
• PQC templates: wolfTPM2_GetKeyTemplate_MLDSA_ex / HASH_MLDSA_ex /MLKEM_ex (adds nameAlg)

ZD 22037