refactor: rename aim to upm and extract appimage module

crates/aim-core/Cargo.toml

@@ -1,22 +0,0 @@
-[package]
-name = "aim-core"
-version.workspace = true
-edition.workspace = true
-license.workspace = true
-
-[lib]
-path = "src/lib.rs"
-
-[dependencies]
-base64.workspace = true
-fs2.workspace = true
-md5.workspace = true
-quick-xml.workspace = true
-reqwest.workspace = true
-serde.workspace = true
-serde_yaml.workspace = true
-sha2.workspace = true
-toml.workspace = true
-
-[dev-dependencies]
-tempfile.workspace = true