Create a page used to issue execution tokens

[longtomjr]

• On page load, request attestation JWT for the authorization enclave (Depends on: Add endpoint for requesting attestation JWT for the authorization enclave rtc-data#40)
• Display the attestation result in a similar manner as the upload data page (use the same component)
• Have text inputs for
  • Data access key
  • Data UUID / Identifier
  • SHA 256 hash of the binary that the data owner wants to allow execution for
  • Number of uses this token should be valid for
• Seal the above with tweetnacl.box using the public key from the attestation, the private part of an ephemeral keypair and a new nonce.
• POST the sealed box to the token issuing endpoint alongside the metadata (public part of the ephemeral keypair and the nonce) (Depends on: Add endpoint for requesting execution tokens rtc-data#41)
• Decrypt the result from the POST call, and show the execution token to the user: Post sealed box & Decrypt response #19
• Test that everything works