Remove circular dependency causing problems in lib consumer

[diehuxx]

We have some circular dependencies in dwn-sdk-js that we should consider removing/resolving. One circular dependency in particular is causing issues in consumers of dwn-sdk-js.

In this PR dwn-sql-store, we are getting the following error upon running tests:

ReferenceError: Cannot access 'ed25519' before initialization
at (/home/runner/work/dwn-sql-store/dwn-sql-store/node_modules/@tbd54566975/dwn-sdk-js/src/jose/algorithms/signing/signature-algorithms.ts:8:17)
at ModuleJob.run (node:internal/modules/esm/module_job:217:25)
at async ModuleLoader.import (node:internal/modules/esm/loader:316:24)
at async importModuleDynamicallyWrapper (node:internal/vm/module:431:15)
at async formattedImport (/home/runner/work/dwn-sql-store/dwn-sql-store/node_modules/mocha/lib/nodejs/esm-utils.js:9:14)
at async exports.requireOrImport (/home/runner/work/dwn-sql-store/dwn-sql-store/node_modules/mocha/lib/nodejs/esm-utils.js:42:28)
at async exports.loadFilesAsync (/home/runner/work/dwn-sql-store/dwn-sql-store/node_modules/mocha/lib/nodejs/esm-utils.js:100:20)
at async singleRun (/home/runner/work/dwn-sql-store/dwn-sql-store/node_modules/mocha/lib/cli/run-helpers.js:125:3)
at async exports.handler (/home/runner/work/dwn-sql-store/dwn-sql-store/node_modules/mocha/lib/cli/run.js:370:5)

This culprit is importing index.js in ed25519.ts in this PR: https://github.com/TBD54566975/dwn-sdk-js/pull/591/files#diff-1b59382673e9e3dc1c3ec5cc4aebccb275379aa957877a6c0bdf8a6d2cadfcc0R5

Importing directly from dwn-error.ts instead of index.js fixed the error in dwn-sql-store.

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[codecov-commenter]

Codecov Report

Merging #598 (1330bea) into main (9a4edc6) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #598   +/-   ##
=======================================
  Coverage   97.82%   97.82%           
=======================================
  Files          66       66           
  Lines        8373     8373           
  Branches     1200     1200           
=======================================
  Hits         8191     8191           
  Misses        176      176           
  Partials        6        6           

Files	Coverage Δ
src/jose/algorithms/signing/ed25519.ts	95.08% <100.00%> (ø)