chore!(project): use internal directory

gleam.toml

@@ -1,5 +1,5 @@
 name = "pine"
-version = "0.0.2"
+version = "0.0.3"
 
 # Fill out these fields if you intend to generate HTML documentation or publish
 # your project to the Hex package manager.

src/pine.gleam

@@ -1,11 +1,11 @@
 import birl
 import gleam/list
 import gleam/order
-import pine/attribute
-import pine/format
-import pine/level
-import pine/log
-import pine/transport
+import pine/internal/attribute
+import pine/internal/format
+import pine/internal/level
+import pine/internal/log
+import pine/internal/transport
 
 /// The logger type. This is opaque by default to prevent developers from relying
 /// on implementation details that may change.