New VA108xx Rust workspace structure + dependency updates

- The workspace is now a monorepo without submodules. The HAL, PAC and BSP
  are integrated directly
- Update all dependencies: embedded-hal v1 and RTIC v2

va108xx-hal/src/time.rs

@@ -0,0 +1,26 @@
+//! Time units
+
+// Frequency based
+
+/// Hertz
+pub type Hertz = fugit::HertzU32;
+
+/// KiloHertz
+pub type KiloHertz = fugit::KilohertzU32;
+
+/// MegaHertz
+pub type MegaHertz = fugit::MegahertzU32;
+
+// Period based
+
+/// Seconds
+pub type Seconds = fugit::SecsDurationU32;
+
+/// Milliseconds
+pub type Milliseconds = fugit::MillisDurationU32;
+
+/// Microseconds
+pub type Microseconds = fugit::MicrosDurationU32;
+
+/// Nanoseconds
+pub type Nanoseconds = fugit::NanosDurationU32;