[feat] Organized exports with separate submodules (#54)

* add utilities module

* chore: clean up + prepare for deno 2.0

* chore: bump to deno 2

* move core stuff to "packages"

* fix exports

* remove deno.json

* fix core imports

* fix ./core export

---------

Co-authored-by: Dean Srebnik <49134864+load1n9@users.noreply.github.com>

Author: retraigo

CONTRIBUTING.md

@@ -5,25 +5,47 @@
 Unoptimized:
 
 ```sh
-cargo build
+cargo build --release -p netsaur
 ```
 
 Optimized:
 
 ```sh
-cargo build --release
+deno run build:cpu
 ```
 
 ## Building `backends/wasm`
 
 Unoptimized:
 
 ```sh
-deno run -A https://deno.land/x/wasmbuild@0.11.0/main.ts --out src/backends/wasm/lib --debug
+deno -Ar jsr:@deno/wasmbuild@0.17.2 -p netsaur --out src/backends/wasm/lib --debug
 ```
 
 Optimized:
 
 ```sh
-deno run -A https://deno.land/x/wasmbuild@0.11.0/main.ts --out src/backends/wasm/lib
+deno run build:wasm
+```
+
+## Building `tokenizers`
+
+Unoptimized:
+
+```sh
+deno -Ar jsr:@deno/wasmbuild@0.17.2 -p netsaur-tokenizers --out tokenizers/lib --debug
+```
+
+Optimized:
+
+```sh
+deno run build:tokenizers
+```
+
+## Building everything
+
+Optimized:
+
+```sh
+deno run build
 ```