Investigate bundle size growth after modernization

[Shaptic]

Parent Epic: #792

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Description

After the work that went into releasing v11.0.0-beta, the bundle size has actually increased overall despite stellar-base getting much (67%) smaller. Some investigation needs to be done to uncover why this is the case, then the (heretofore unknown) work needs to be done to resolve this.

Some progress has already been made by removing and/or minimizing unnecessary dependencies (see #822 and #823), but more needs to be done. Hypotheses include:

• unavoidable dependencies growing in size since the upgrade (e.g. I think axios got a buttload bigger)
• glaring bundler mistakes (e.g. some dependencies not being minimized?)
• unnecessarily aggressive global imports (e.g. you need some lib.module.tinyFunction but you import * from lib, instead)
• other dependencies that provide redundant native functionality

Current Statistics

A reduction in the current bundle size:

Assets:
  stellar-sdk (2.02 MiB)
  stellar-sdk.min (725 KiB)

to be closer to (or, ideally, better than) that of the latest stable version (v10.4.1):

Assets: 
  stellar-sdk.js (1.65 MiB)
  stellar-sdk.min.js (568 KiB)

Acceptance Criteria

A clear path forward on how to reduce bundle size.

[Shaptic]

#836 tracks work that came out of investigating this issue.