Refactor to optimize tree shaking

**Describe the bug**
Right now the identity class has methods that depend on the ethers library. These methods are not useful for the typical app and should not require bundling the ethers lib if it's not needed.

**To Reproduce**
Run a build using any js bundler: webpack, rollup, esbuild, etc. After importing and using any identity method (login, logout, etc). If you check the bundled output it includes the entire ethers lib.

**Expected behavior**
If we don't require and use any ethereum related functions, we should be able to tree shake away the ethers dependency.