feat: add createMarkdown() factory to expose the compiler and parser

.changeset/dry-melons-press.md

@@ -0,0 +1,5 @@
+---
+'markdown-to-jsx': major
+---
+
+Bump minimum React version to 16+. `markdown-to-jsx` can now return strings directly without needing a wrapper unless forced via `options.forceWrapper`.

.changeset/five-frogs-repair.md

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+---
+'markdown-to-jsx': minor
+---
+
+Add `options.enableRules` and `options.disableRules`; this allows for individual syntaxes to be conditionally switched on/off as desired.

.changeset/sour-llamas-develop.md

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+---
+'markdown-to-jsx': minor
+---
+
+Add `options.customRules`, this allows for novel functionality to be implemented in tandem with `options.renderRule`.

.changeset/spicy-cherries-suffer.md

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+---
+'markdown-to-jsx': major
+---
+
+Introduce the `createMarkdown(options)` factory function. This factory wraps and replaces the prior `compiler(input, options)` top-level export, while also exposing the AST parser directly for ✨ advanced use cases ✨.
+
+```tsx
+import { createMarkdown } from 'markdown-to-jsx'
+
+// parser = receive AST without going directly to React, allows for complete override
+// compiler = parser + React output (the equivalent of using the `Markdown` component)
+// Markdown = React component for convenience
+const { Markdown, compiler, parser } = createMarkdown({
+  /* any options here */
+})
+```