refactor: Improve function exports

[zoey-kaiser]

Closes N/A

Exports all PDF components directly instead of injecting them into the PDF object. This reduces the total bundle size and allows code splitting to only import the needed components instead of requiring that the module injects all the components on PDF initialization.

Improves inline documentation for all functions and removes dirty function types. These are functions, where the export type is not properly defined, leading to TS needing to infer the type, instead of it being properly set.

Checklist:

• issue number linked above after pound (#)
  • replace "Closes " with "Contributes to" or other if this PR does not close the issue
• manually checked my feature / checking not applicable
• wrote tests / testing not applicable
• attached screenshots / screenshot not applicable