Add patches for directories/directories-next/option-ext

The rational is detailed in the root Cargo.toml.

While I don't personally mind MPL dependencies, even if I don't prefer them
(they're allowed in the deny.toml for a reason), I do mind the pointless scope
creep and wish to highlight how little it actually used from the crate by
re-defining it as the single function.

We could also fork directories-next, or directories, and remove the usage of
option-ext per https://github.com/dirs-dev/dirs-sys-rs/issues/24, yet that'd be
a much larger task than what was done here.

In the future, it may be beneficial to submit a PR to wasmtime replacing
directories-next with home, a cargo-team maintained library to get the home
directory and associated folders. An example migration can be found at
https://github.com/harryfei/which-rs/pull/80.

Cargo.toml

@@ -36,6 +36,8 @@ members = [
   "coordinator/tributary",
   "coordinator",
 
+  "substrate/tree-cleanup/option-ext",
+  "substrate/tree-cleanup/directories-next",
   "substrate/tree-cleanup/bandersnatch_vrfs",
   "substrate/tree-cleanup/w3f-bls",
 
@@ -100,6 +102,17 @@ lazy_static = { git = "https://github.com/rust-lang-nursery/lazy-static.rs", rev
 sp-core-hashing = { git = "https://github.com/serai-dex/polkadot-sdk", branch = "experimental" }
 sp-std = { git = "https://github.com/serai-dex/polkadot-sdk", branch = "experimental" }
 
+# directories-next was created because directories was unmaintained
+# directories-next is now unmaintained while directories is maintained
+# The directories author pulls in ridiculously pointless crates and prefers
+# copyleft licenses
+# Serai's polkadot-sdk consolidated to directories-next, as directories-next is
+# acceptable and because we couldn't consolidate to directories without forking
+# wasmtime
+# The following two patches resolve everything
+option-ext = { path = "substrate/tree-cleanup/option-ext" }
+directories-next = { path = "substrate/tree-cleanup/directories-next" }
+
 # cargo believes the following are in-tree despite no features activating them
 # We provide empty crates to not only prove they're unused, yet also clean up
 # our Cargo.lock