cargo: explicitly indicate paths to publish

Running `cargo publish` from a non-colocated repo (such as my usual
repo) is currently quite scary because it uploads all non-hidden
files, even if they're ignored by `.gitignore`
(rust-lang/cargo#2063). I noticed this a
while ago and have always run the command from a fresh clone since
then. To avoid the need for that, let's use the workaround mentioned
on the bug, which is to explicitly list patterns we want to publish.

cli/Cargo.toml

@@ -13,6 +13,8 @@ repository = { workspace = true }
 documentation = { workspace = true }
 keywords = { workspace = true }
 
+include = ["/LICENSE", "/examples/", "/src/", "/testing/", "/tests/"]
+
 [[bin]]
 name = "jj"
 path = "src/main.rs"

lib/Cargo.toml

@@ -12,6 +12,8 @@ repository = { workspace = true }
 documentation = { workspace = true }
 readme = { workspace = true }
 
+include = ["/LICENSE", "/benches/", "/src/", "/tests/"]
+
 [[test]]
 name = "runner"
 

lib/proc-macros/Cargo.toml

@@ -11,6 +11,8 @@ repository = { workspace = true }
 documentation = { workspace = true }
 readme = { workspace = true }
 
+include = ["/LICENSE", "/src/"]
+
 [lib]
 proc-macro = true