feat: add example scripts for argparse, bytes, dataset, html, markdown, uuid, wdantic, and web chat modules

Add comprehensive demo scripts showcasing the usage of multiple Wren modules including argument parsing, byte manipulation, in-memory dataset operations, HTML encoding/slugification, markdown-to-HTML conversion, UUID generation/validation, schema validation with wdantic, and a full web chat application with REST endpoints.

test/web/response.wren

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+// retoor <retoor@molodetz.nl>
+
+import "web" for Response
+
+var r1 = Response.text("Hello")
+System.print(r1.body) // expect: Hello
+System.print(r1.headers["Content-Type"].contains("text/plain")) // expect: true
+
+var r2 = Response.html("<h1>Hi</h1>")
+System.print(r2.body) // expect: <h1>Hi</h1>
+System.print(r2.headers["Content-Type"].contains("text/html")) // expect: true
+
+var r3 = Response.json({"name": "test"})
+System.print(r3.body.contains("name")) // expect: true
+System.print(r3.headers["Content-Type"].contains("application/json")) // expect: true
+
+var r4 = Response.redirect("/login")
+System.print(r4.status) // expect: 302
+System.print(r4.headers["Location"]) // expect: /login

test/web/router.wren

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+// retoor <retoor@molodetz.nl>
+
+import "web" for Router
+
+var router = Router.new()
+router.get("/", Fn.new { |r| "home" })
+router.get("/users/:id", Fn.new { |r| "user" })
+router.post("/api/data", Fn.new { |r| "data" })
+
+var m1 = router.match("GET", "/")
+System.print(m1 != null) // expect: true
+
+var m2 = router.match("GET", "/users/123")
+System.print(m2 != null) // expect: true
+System.print(m2["params"]["id"]) // expect: 123
+
+var m3 = router.match("POST", "/api/data")
+System.print(m3 != null) // expect: true
+
+var m4 = router.match("GET", "/notfound")
+System.print(m4 == null) // expect: true

test/web/session.wren

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+// retoor <retoor@molodetz.nl>
+
+import "web" for SessionStore
+
+var store = SessionStore.new()
+var session = store.create()
+System.print(session.id != null) // expect: true
+System.print(session.id.count) // expect: 36
+
+session["user"] = "alice"
+System.print(session["user"]) // expect: alice
+
+store.save(session)
+var retrieved = store.get(session.id)
+System.print(retrieved != null) // expect: true
+System.print(retrieved["user"]) // expect: alice
+
+store.destroy(session.id)
+System.print(store.get(session.id) == null) // expect: true