Move top-level Cargo.toml to oak/server

[rbehjati]

This change:

• Moves top-level Cargo.toml and Cargo.lock to oak/server
• Updates the scripts and the README files accordingly
• Removes --target-dir flags in scripts/build_example

Ref #971

Checklist

• Pull request affects core Oak functionality (e.g. runtime, SDK, ABI)
  • I have written tests that cover the code changes.
  • I have checked that these tests are run by
    Cloudbuild
  • I have updated documentation accordingly.
  • I have raised an issue to
    cover any TODOs and/or unfinished work.
• Pull request includes prototype/experimental work that is under
  construction.

[rbehjati]

I think this line can be removed too:

oak/runner/src/main.rs

Line 237 in 2709157

"//oak/server/loader:oak_runner",

Or perhaps the entire build cpp server step should be removed. WDYT @tiziano88?

[tiziano88]

Not sure which step are you referring to? In any case @ipetr0v and / or @conradgrobler may be able to advise.

[rbehjati]

I meant the following chunk of code in the runner:

oak/runner/src/main.rs

Lines 217 to 242 in 2709157

	v => {
	let config = match v {
	"base" => {
	if is_mac_os() {
	"darwin"
	} else {
	"clang"
	}
	}
	"logless" => "clang-logless",
	"arm" => "armv8",
	"asan" => "asan",
	"tsan" => "tsan",
	_ => panic!("unknown variant: {}", v),
	};
	Step::Single {
	name: "build cpp server".to_string(),
	command: bazel_build(
	&[&format!("--config={}", config)],
	&[
	"//oak/server/loader:oak_runner",
	"//oak/server/storage:storage_server",
	],
	),
	}
	}

Its bash counterpart was removed in #1016.

[tiziano88]

Not sure which step are you referring to? In any case @ipetr0v and / or @conradgrobler may be able to advise.