apis: i2c_master_slave: add support

Adds support to the i2c master slave sycall api for libtock-rs. The
current implementation implements all the functionality synchronously.

This api was testing using 2 Particle Boron boards (nrf52840 based)
setup as a master and slave device. Additionally, this api was also tested by
communicating with an MCP9808 sensor as an I2C master, again using the
Particle Boron.

Signed-off-by: Wilfred Mallawa <wilfred.mallawa@wdc.com>

Cargo.toml

@@ -25,6 +25,7 @@ libtock_buzzer = {path = "apis/buzzer"}
 libtock_console = { path = "apis/console" }
 libtock_debug_panic = { path = "panic_handlers/debug_panic" }
 libtock_gpio = { path = "apis/gpio" }
+libtock_i2c_master_slave = { path = "apis/i2c_master_slave" }
 libtock_leds = { path = "apis/leds" }
 libtock_low_level_debug = { path = "apis/low_level_debug" }
 libtock_ninedof = { path = "apis/ninedof" }
@@ -58,6 +59,7 @@ members = [
     "apis/buzzer",
     "apis/console",
     "apis/gpio",
+    "apis/i2c_master_slave",
     "apis/leds",
     "apis/low_level_debug",
     "apis/ninedof",

apis/i2c_master_slave/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "libtock_i2c_master_slave"
+version = "0.1.0"
+authors = [
+    "Tock Project Developers <tock-dev@googlegroups.com>",
+    "Wilfred Mallawa <wilfred.mallawa@wdc.com>",
+]
+license = "Apache-2.0 OR MIT"
+edition = "2021"
+repository = "https://www.github.com/tock/libtock-rs"
+rust-version.workspace = true
+description = "libtock I2C master-slave driver"
+
+[dependencies]
+libtock_platform = { path = "../../platform" }
+