refactor(quote): move TCB level logic to a dedicated module

- Extracted `TcbLevel` functionality from `sgx` module to `quote::tcblevel`.
- Updated all references to import `TcbLevel` and related utilities from `quote::tcblevel`.
- Updated copyright headers to reflect the new year range.

Signed-off-by: Harald Hoyer <harald@matterlabs.dev>

bin/verify-attestation/src/main.rs

@@ -7,9 +7,9 @@ use anyhow::{bail, Context, Result};
 use clap::Parser;
 
 use std::{fs, io::Read, path::PathBuf, str::FromStr, time::UNIX_EPOCH};
-use teepot::{
-    quote::{error, tee_qv_get_collateral, verify_quote_with_collateral, QuoteVerificationResult},
-    sgx::TcbLevel,
+use teepot::quote::{
+    error, tcblevel::TcbLevel, tee_qv_get_collateral, verify_quote_with_collateral,
+    QuoteVerificationResult,
 };
 
 #[derive(Parser, Debug)]