fix(ext/node): implement asymmetric keygen (denoland#18651)

Towards denoland#18455 

This commit implements the keypair generation for asymmetric keys for
the `generateKeyPair` API.

See how key material is managed in this implementation:
https://www.notion.so/denolandinc/node-crypto-design-99fc33f568d24e47a5e4b36002c5325d?pvs=4

Private and public key encoding depend on `KeyObject#export` which is
not implemented. I've also skipped ED448 and X448 since we need a crate
for that in WebCrypto too.

.github/workflows/ci.generate.ts

@@ -17,7 +17,7 @@ const Runners = (() => {
 })();
 // bump the number at the start when you want to purge the cache
 const prCacheKeyPrefix =
-  "19-cargo-target-${{ matrix.os }}-${{ matrix.profile }}-${{ matrix.job }}-";
+  "20-cargo-target-${{ matrix.os }}-${{ matrix.profile }}-${{ matrix.job }}-";
 
 const installPkgsCommand =
   "sudo apt-get install --no-install-recommends debootstrap clang-15 lld-15";

.github/workflows/ci.yml

@@ -302,7 +302,7 @@ jobs:
             !./target/*/*.zip
             !./target/*/*.tar.gz
           key: never_saved
-          restore-keys: '19-cargo-target-${{ matrix.os }}-${{ matrix.profile }}-${{ matrix.job }}-'
+          restore-keys: '20-cargo-target-${{ matrix.os }}-${{ matrix.profile }}-${{ matrix.job }}-'
       - name: Apply and update mtime cache
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr) && (!startsWith(github.ref, ''refs/tags/''))'
         uses: ./.github/mtime_cache
@@ -578,7 +578,7 @@ jobs:
             !./target/*/gn_out
             !./target/*/*.zip
             !./target/*/*.tar.gz
-          key: '19-cargo-target-${{ matrix.os }}-${{ matrix.profile }}-${{ matrix.job }}-${{ github.sha }}'
+          key: '20-cargo-target-${{ matrix.os }}-${{ matrix.profile }}-${{ matrix.job }}-${{ github.sha }}'
   publish-canary:
     name: publish canary
     runs-on: ubuntu-22.04