src: use named struct instead of typedef

[tniessen]

There is no reason to use typedef with an unnamed struct here, and using a named struct is consistent with the rest of the codebase.

[nodejs-github-bot]

Review requested:

• @nodejs/crypto

[github-actions]

Fast-track has been requested by @tniessen. Please 👍 to approve.

[nodejs-github-bot]

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----------------------------------- PR info ------------------------------------
Title      src: use named struct instead of typedef (#43881)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     tniessen:src-crypto-named-struct-instead-of-typedef -> nodejs:main
Labels     crypto, c++, fast-track, author ready, needs-ci
Commits    1
 - src: use named struct instead of typedef
Committers 1
 - Tobias Nießen 
PR-URL: https://github.com/nodejs/node/pull/43881
Reviewed-By: Ben Noordhuis 
Reviewed-By: Darshan Sen 
Reviewed-By: Antoine du Hamel 
Reviewed-By: Filip Skokan 
Reviewed-By: Ruben Bridgewater 
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/43881
Reviewed-By: Ben Noordhuis 
Reviewed-By: Darshan Sen 
Reviewed-By: Antoine du Hamel 
Reviewed-By: Filip Skokan 
Reviewed-By: Ruben Bridgewater 
--------------------------------------------------------------------------------
   ℹ  This PR was created on Mon, 18 Jul 2022 01:07:39 GMT
   ✔  Approvals: 5
   ✔  - Ben Noordhuis (@bnoordhuis): https://github.com/nodejs/node/pull/43881#pullrequestreview-1041218971
   ✔  - Darshan Sen (@RaisinTen) (TSC): https://github.com/nodejs/node/pull/43881#pullrequestreview-1041269289
   ✔  - Antoine du Hamel (@aduh95) (TSC): https://github.com/nodejs/node/pull/43881#pullrequestreview-1041450210
   ✔  - Filip Skokan (@panva): https://github.com/nodejs/node/pull/43881#pullrequestreview-1041452969
   ✔  - Ruben Bridgewater (@BridgeAR) (TSC): https://github.com/nodejs/node/pull/43881#pullrequestreview-1041489816
   ℹ  This PR is being fast-tracked
   ✖  Last GitHub CI failed
   ℹ  Last Full PR CI on 2022-07-18T10:06:50Z: https://ci.nodejs.org/job/node-test-pull-request/45517/
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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/45529/

[nodejs-github-bot]

Landed in aeb1c1b