feat: Add completion for builtin types with documentation

closes #80

Author: asharkhan3101

src/docs.rs

@@ -0,0 +1,72 @@
+use std::{collections::HashMap, sync::LazyLock};
+
+macro_rules! docmap_builtin {
+    ($name:literal) => {
+        ($name, include_str!(concat!("docs/builtin/", $name, ".md")))
+    };
+}
+
+macro_rules! docmap_wellknown {
+    ($name:literal) => {
+        (
+            concat!("google.protobuf.", $name),
+            include_str!(concat!("docs/wellknown/", $name, ".md")),
+        )
+    };
+}
+
+pub static BUITIN: LazyLock<HashMap<&'static str, &'static str>> = LazyLock::new(|| {
+    HashMap::from([
+        docmap_builtin!("int32"),
+        docmap_builtin!("int64"),
+        docmap_builtin!("uint32"),
+        docmap_builtin!("uint64"),
+        docmap_builtin!("sint32"),
+        docmap_builtin!("sint64"),
+        docmap_builtin!("fixed32"),
+        docmap_builtin!("fixed64"),
+        docmap_builtin!("sfixed32"),
+        docmap_builtin!("sfixed64"),
+        docmap_builtin!("float"),
+        docmap_builtin!("double"),
+        docmap_builtin!("string"),
+        docmap_builtin!("bytes"),
+        docmap_builtin!("bool"),
+        docmap_builtin!("default"),
+    ])
+});
+
+pub static WELLKNOWN: LazyLock<HashMap<&'static str, &'static str>> = LazyLock::new(|| {
+    HashMap::from([
+        docmap_wellknown!("Any"),
+        docmap_wellknown!("Api"),
+        docmap_wellknown!("BoolValue"),
+        docmap_wellknown!("BytesValue"),
+        docmap_wellknown!("DoubleValue"),
+        docmap_wellknown!("Duration"),
+        docmap_wellknown!("Empty"),
+        docmap_wellknown!("Enum"),
+        docmap_wellknown!("EnumValue"),
+        docmap_wellknown!("Field"),
+        docmap_wellknown!("Field.Cardinality"),
+        docmap_wellknown!("Field.Kind"),
+        docmap_wellknown!("FieldMask"),
+        docmap_wellknown!("FloatValue"),
+        docmap_wellknown!("Int32Value"),
+        docmap_wellknown!("Int64Value"),
+        docmap_wellknown!("ListValue"),
+        docmap_wellknown!("Method"),
+        docmap_wellknown!("Mixin"),
+        docmap_wellknown!("NullValue"),
+        docmap_wellknown!("Option"),
+        docmap_wellknown!("SourceContext"),
+        docmap_wellknown!("StringValue"),
+        docmap_wellknown!("Struct"),
+        docmap_wellknown!("Syntax"),
+        docmap_wellknown!("Timestamp"),
+        docmap_wellknown!("Type"),
+        docmap_wellknown!("UInt32Value"),
+        docmap_wellknown!("UInt64Value"),
+        docmap_wellknown!("Value"),
+    ])
+});