Add es-lint on lib

[1devNdogs]

Summary

• 12

Added es-lint using eslint:recommended

Eslint files.

• .eslintignore

• .eslintrc.json

• package.json : Add dependencies and lint script.

• src/subspaceClient.ts : When using recommended es-lint rules the lint script throw an error for putObject method using async on promise executor.

  • Removed async and await for dynamic import.
  • Created a private method to sendObject on both cases, for injected extension account and loaded account from seed.

[nazar-pc]

The next step is to add corresponding checks to CI