feat: refactor for bundling tools

[bguiz]

Problem

• when I try to use Javascript build/ bundle tools, such as bun build/ parcel/ rollup/ webpack
• there is a need to import or require the entire SDK
• there is no option to import or require only the specific parts of the SDK that my application needs to use.
• the size of the bundle including the SDK is unnecessarily large when my application only uses a small fraction of it

Solution

• refactor the SDK code base such that it enables, and is optimised for:
  • specific imports
  • tree-shaking in JS build/ bundle tools
• provide documentation on recommended usage with common JS build/ bundle tools
  • e.g. provide a webpack.config.js file for developers using webpack

Alternatives

Refs

• discussion - https://swirldslabs.slack.com/archives/C0453UVBR42/p1712460885992259
• related issue: Bundle issue in browser environment with esbuild #2173
• related issue: Modernize and improve bundle size #1719
• developer friction point: https://stackoverflow.com/q/78271342/194982
• illustration of problem: https://github.com/InternetOfPeers/hedera-sdk-js-standalone-library-example
• illustration of problem: https://github.com/hedera-dev/hedera-code-snippets/blob/feat/dapp-hedera-sdk/dapp-hedera-sdk/