Add signature providers

Requires: common-ci-configuration!75 (merged)

ts/packages/signers-keychain/package.json

 {
   "name": "@hiveio/wax-signers-keychain",
-  "version": "Run-Prepack-First",
+  "version": "0.0.0-Run-Prepack",
   "description": "Wax signer library extending transaction signing possibilities by a 3rd party Web-only extension - Keychain",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",