feat: add chat completion without streaming

.gitignore

@@ -0,0 +1,25 @@
+########################################
+# Rust
+
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+########################################
+# Custom
+
+# Tarpaulin coverage output
+/cobertura.xml
+
+.env