chore: optimize cargo workspace settings

- move global settings, `edition`, `version` to the root `Cargo.toml`.
- add the dir `/examples` as workspace members, and add `multi-plugin` as cargo example target.
- move examples profile settings to root `Cargo.toml` (because the profile settings only work in the root `Cargo.toml`)
- set the members of workspace to inherit settings from the root `Cargo.toml`.
- update `Cargo.lock` (because of examples deps).
- remove `examples/Cargo.lock` (of course, `examples` now is a member of workspace, so it can not have lock file).
- reformat all the Cargo file with taplo.

Cargo.toml

@@ -1,7 +1,20 @@
 [workspace]
 resolver = "2"
-members = ["mania", "mania-macros"]
+members = ["mania", "mania-macros", "examples"]
+
+[workspace.package]
+version = "0.0.1"
+edition = "2021"
+license-file = "LICENCE"
 
 [workspace.dependencies]
 md-5 = "0.10.6"
-hex = "0.4.3"
+hex = "0.4.3"
+
+[profile.release]
+opt-level = 2
+debug = false
+lto = true
+incremental = false
+codegen-units = 1
+strip = true