Replace CommonJS-only dependencies with inline ESM code

Problem

When using mathjs in an Angular project (and likely other modern ESM-first bundlers), the following warnings are emitted during the build:

▲ [WARNING] Module 'seedrandom' used by 'node_modules/mathjs/lib/esm/function/probability/util/seededRNG.js' is not ESM

▲ [WARNING] Module 'escape-latex' used by 'node_modules/mathjs/lib/esm/utils/latex.js' is not ESM

▲ [WARNING] Module 'javascript-natural-sort' used by 'node_modules/mathjs/lib/esm/function/relational/compareNatural.js' is not ESM

▲ [WARNING] Module 'tiny-emitter' used by 'node_modules/mathjs/lib/esm/utils/emitter.js' is not ESM

CommonJS or AMD dependencies can cause optimization bailouts. For more information see: https://angular.dev/tools/cli/build#configuring-commonjs-dependencies

Proposal

All four of these dependencies are tiny libraries that haven't been updated in 7+ years:

Since they are unmaintained and unlikely to ever ship ESM builds, I'd suggest inlining their code directly into mathjs as proper ESM modules. This would:

1. Eliminate the CommonJS warnings for Angular/esbuild/Vite users
2. Allow tree-shaking to work properly on this code
3. Remove external dependencies that are effectively abandoned

I'll follow up with PRs to inline each of these.