fix(did-provider-key): use compressed keys for creating Secp256k1 did:key

[mirceanis]

What issue is this PR fixing

fixes #1213

What is being changed

Creating did:key identifiers with keyType set to Secp256k1 will use compressed public keys when computing the identifier specific string.
This PR also adds the ability to the resolver to resolve did:key identifiers based on uncompressed keys.

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: 100.00% and no project coverage change.

Comparison is base (75048ce) 84.85% compared to head (1a4c8e8) 84.85%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #1217   +/-   ##
=======================================
  Coverage   84.85%   84.85%           
=======================================
  Files         167      167           
  Lines       18065    18067    +2     
  Branches     2028     2029    +1     
=======================================
+ Hits        15329    15331    +2     
  Misses       2736     2736           

Files Changed	Coverage Δ
packages/did-provider-key/src/key-did-provider.ts	77.44% <100.00%> (+0.17%)	⬆️
packages/did-provider-key/src/resolver.ts	77.77% <100.00%> (+0.41%)	⬆️

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