Remove all standard library aliases

[ken-matsui]

Remove all standard library aliases from src/Rustify/Aliases.hpp. We also want to remove headers from this file, and add headers to files that previously depended on those aliases accordingly. This may improve the compilation performance, but the main purpose for this is to simplify code writing.

poac/src/Rustify/Aliases.hpp

Lines 36 to 70 in f32c760

	template <typename T, usize N>
	using Arr = std::array<T, N>;
	template <typename T>
	using Vec = std::vector<T>;
	template <typename K, typename V>
	using HashMap = std::unordered_map<K, V>;
	template <typename K>
	using HashSet = std::unordered_set<K>;
	template <typename T>
	using Option = std::optional<T>;
	struct NoneT : protected std::monostate {
	constexpr bool operator==(const usize rhs) const {
	return std::string_view::npos == rhs;
	}
	// NOLINTNEXTLINE(google-explicit-constructor)
	constexpr operator std::nullopt_t() const {
	return std::nullopt;
	}
	template <typename T>
	constexpr operator Option<T>() const { // NOLINT(google-explicit-constructor)
	return std::nullopt;
	}
	};
	inline constinit const NoneT None; // NOLINT(readability-identifier-naming)
	inline std::ostream&
	operator<<(std::ostream& os, const NoneT& /*unused*/) {
	return os << "None";
	}

Here are some relevant PRs:

• Remove String alias #947
• Remove Path alias #948
• Remove Fn alias #949
• Remove Map, Set, and Tuple aliases #950
• Remove StringRef alias #951