Move crates under a sub folder to clean up the code

crates/filter-parser/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "filter-parser"
+description = "The parser for the Meilisearch filter syntax"
+publish = false
+
+version.workspace = true
+authors.workspace = true
+# description.workspace = true
+homepage.workspace = true
+readme.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+nom = "7.1.3"
+nom_locate = "4.2.0"
+unescaper = "0.1.5"
+
+[dev-dependencies]
+insta = "1.39.0"