feat(did-key-provider): add key import support

[tadejpodrekar]

What is being changed

Add the key import functionality to the did-key-provider. Users can import Ed25519, X25519 or Secp256k1 private keys and use them to generate a did:key identifier.

Quality

Check all that apply:

• I want these changes to be integrated
• I successfully ran pnpm i, pnpm build, pnpm test, pnpm test:browser locally.
• I allow my PR to be updated by the reviewers (to speed up the review process).
• I added unit tests.
• I added integration tests.

[codecov]

Codecov Report

Patch coverage: 84.74% and project coverage change: +4.81 🎉

Comparison is base (125bf42) 80.25% compared to head (35ecf02) 85.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1165      +/-   ##
==========================================
+ Coverage   80.25%   85.06%   +4.81%     
==========================================
  Files         118      154      +36     
  Lines        4056    15738   +11682     
  Branches      875     1662     +787     
==========================================
+ Hits         3255    13387   +10132     
- Misses        798     2351    +1553     
+ Partials        3        0       -3     

Impacted Files	Coverage Δ
packages/core-types/src/coreEvents.ts	100.00% <ø> (ø)
...s/credential-ld/src/module-types/jsonld/index.d.ts	0.00% <0.00%> (ø)
packages/data-store-json/src/types.ts	0.00% <0.00%> (ø)
packages/did-comm/src/didcomm.ts	83.26% <ø> (+10.12%)	⬆️
packages/did-comm/src/index.ts	100.00% <ø> (ø)
packages/did-comm/src/message-handler.ts	72.10% <ø> (+12.64%)	⬆️
.../protocols/coordinate-mediation-message-handler.ts	89.63% <ø> (ø)
packages/did-comm/src/protocols/index.ts	100.00% <ø> (ø)
...omm/src/protocols/messagepickup-message-handler.ts	91.25% <ø> (ø)
.../did-comm/src/protocols/routing-message-handler.ts	89.65% <ø> (ø)
... and 83 more

... and 61 files with indirect coverage changes

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[mirceanis]

This looks great!
Thanks for adding it.