Added color and history to cheriot debug cli

PiperOrigin-RevId: 903386333
Change-Id: Idb8797feb1ad25363563c7eed6d287dd5dd00f27

riscv/debug_command_shell.cc

diff --git a/riscv/debug_command_shell.cc b/riscv/debug_command_shell.cc
index 36ae310..8c68cee 100644
--- a/riscv/debug_command_shell.cc
+++ b/riscv/debug_command_shell.cc
@@ -408,7 +408,9 @@
       auto result =
           core_access_[current_core_].debug_interface->ReadRegister(name);
       if (result.ok()) {
-        os << absl::StrCat(name, " = ", absl::Hex(result.value())) << std::endl;
+        os << absl::StrCat(kValueColor, name, " = ", absl::Hex(result.value()),
+                           kDefaultColor)
+           << std::endl;
       } else {
         os << "Error: " << result.status().message() << std::endl;
       }