CTAP library move (#602)

* Moves all CTAP logic into its own library

* workflows fix test

* more coveralls workflow tests

libraries/opensk/src/api/clock.rs

@@ -0,0 +1,39 @@
+// Copyright 2022-2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+pub trait Clock {
+    /// Stores data for the clock to recognize if this timer is elapsed or not.
+    ///
+    /// The Clock does not keep track of the timers it creates. Therefore, they should not wrap
+    /// unexpectedly. A timer that is elapsed may never return to a non-elapsed state.
+    ///
+    /// A default Timer should return `true` when checked with `is_elapsed`.
+    type Timer: Default;
+
+    /// Creates a new timer that expires after the given time in ms.
+    fn make_timer(&mut self, milliseconds: usize) -> Self::Timer;
+
+    /// Checks whether a given timer is expired.
+    ///
+    /// Until a timer expires, this function consistently returns false. Once it expires, this
+    /// function consistently returns true. In particular, it is valid to continue calling this
+    /// function after the first time it returns true.
+    fn is_elapsed(&mut self, timer: &Self::Timer) -> bool;
+
+    /// Timestamp in microseconds.
+    ///
+    /// Normal operation only needs relative time, absolute timestamps are useful for debugging.
+    #[cfg(feature = "debug_ctap")]
+    fn timestamp_us(&mut self) -> usize;
+}