Move Filter representation code to it's own crate

This will be required to break a cyclic dependency when the
josh-starlark based filter will be added.

Author: christian-schilling

Cargo.lock

@@ -6,6 +6,7 @@ members = [
     "hyper-reverse-proxy",
     "josh-core",
     "josh-cli",
+    "josh-filter",
     "josh-graphql",
     "josh-link",
     "josh-proxy",

Cargo.toml

@@ -192,7 +192,7 @@ fn run_filter(args: Vec<String>) -> josh_core::JoshResult<i32> {
         let tree_oid = git2::Oid::from_str(specstr.trim()).map_err(|_| {
             josh_core::josh_error(&format!("Invalid filter spec or SHA: {}", specstr))
         })?;
-        josh_core::filter::persist::from_tree(&repo, tree_oid)?
+        josh_core::filter::from_tree(&repo, tree_oid)?
     };
 
     if !args.get_flag("no-cache") {

josh-cli/src/bin/josh-filter.rs

@@ -18,6 +18,7 @@ backtrace = "0.3.76"
 bitvec = "1.0.1"
 git-version = "0.3.9"
 git2 = { workspace = true }
+josh-filter = { path = "../josh-filter" }
 gix-actor = { workspace = true }
 gix-object = { workspace = true }
 gix-config = { workspace = true }
@@ -49,4 +50,4 @@ rand = "0.9.2"
 criterion2 = { version = "3.0.2" }
 
 [features]
-incubating = []
+incubating = ["josh-filter/incubating"]