feat: separate secp256k1 library (#663)

* removes browserify

* platform node for bundle

* disable secp size check until after package is on main for CI

* Update packages/identity/src/index.ts

* removes stats.html

Co-authored-by: Eric Swanson <64809312+ericswanson-dfinity@users.noreply.github.com>

docs/generated/changelog.html

@@ -12,6 +12,10 @@ <h1>Agent-JS Changelog</h1>
     <section>
       <h2>Version x.x.x</h2>
       <ul>
+        <li>
+          <em>Breaking change:</em> Moves Secp256k1KeyIdentity to its own package.
+          <pre>@dfinity/identity-secp256k1</pre>
+        </li>
         <li>
           <em>Breaking change:</em> Deprecates
           <pre>@dfinity/authentication</pre>

e2e/node/basic/identity.test.ts

@@ -9,9 +9,9 @@ import {
   DelegationChain,
   DelegationIdentity,
   Ed25519KeyIdentity,
-  Secp256k1KeyIdentity,
   ECDSAKeyIdentity,
 } from '@dfinity/identity';
+import { Secp256k1KeyIdentity } from '@dfinity/identity-secp256k1';
 import agent from '../utils/agent';
 import identityCanister from '../canisters/identity';