Rename tools settings for consistency

[dalg24]

As part of our effort to cleanup or initialization settings, this PR is suggesting to make the following changes to the tools options:

• InitializationSetting::{set,has,get}_...: renamed tool_lib -> tools_libs, tool_args -> tools_args, and tool_help -> tools_help
• Command line arguments: renamed --kokkos-tools-{library -> libs}
--kokkos-tools-args and --kokkos-tools-help unchanged.
• Environment variables: renamed KOKKOS_{PROFILE_LIBRARY -> TOOLS_LIBS} and added KOKKOS_TOOLS_ARGS
  We still look for KOKKOS_PROFILE_LIBRARY and raise a warning stating it is deprecated. If both KOKKOS_PROFILE_LIBRARY and KOKKOS_TOOLS_LIBS are set, we ensure that they match.
  Haven't added KOKKOS_TOOLS_HELP. Let me know if you think I should do so.

The Kokkos::Tools::InitArguments struct is not updated as part of this PR.

kokkos/core/src/impl/Kokkos_Profiling.hpp

Lines 64 to 73 in e0347a2

	struct InitArguments {
	// NOTE DZP: PossiblyUnsetOption was introduced
	// before C++17, std::optional is a better choice
	// for this long-term
	static const std::string unset_string_option;
	enum PossiblyUnsetOption { unset, off, on };
	PossiblyUnsetOption help = unset;
	std::string lib = unset_string_option;
	std::string args = unset_string_option;
	};

We still need to decide whether we just want to change the data member name or opt for a design similar to what we did in Core. In any case I would prefer to handle it in a follow-up PR.

[dalg24]

STATUS QUO (BEFORE this PR)	PROPOSED
Kokkos::InitializationSetting::{set,has,get}_tool_lib	Kokkos::InitializationSetting::{set,has,get}_tools_libs
Kokkos::InitializationSetting::{set,has,get}_tool_args	Kokkos::InitializationSetting::{set,has,get}_tools_args
Kokkos::InitializationSetting::{set,has,get}_tool_help	Kokkos::InitializationSetting::{set,has,get}_tools_help
KOKKOS_PROFILE_LIBRARY	KOKKOS_TOOLS_LIBS
	KOKKOS_TOOLS_ARGS
--kokkos-tools-library	--kokkos-tools-libs
--kokkos-tools-args	--kokkos-tools-args
--kokkos-tools-help	--kokkos-tools-help
Kokkos::Tools::InitArguments::lib	Kokkos::Tools::InitArguments::lib
Kokkos::Tools::InitArguments::args	Kokkos::Tools::InitArguments::args
Kokkos::Tools::InitArguments::help	Kokkos::Tools::InitArguments::help

[dalg24]

I would slightly prefer spelling out "libs" -> "libraries". Anyone else on that boat?

[ldh4]

I would slightly prefer spelling out "libs" -> "libraries". Anyone else on that boat?

While I don't have any strong opinion on either option, it kinda looks nice to have all tools options be aligned and have the same lengths by leaving "libs" to have the same character count as "args" and "help".

[crtrott]

I kinda like libraries a bit more too.

[nliber]

If we are going to spell out "libraries", should we also spell out "arguments"?

[dalg24]

My recollection from the dev meeting was we keep the name as they are currently implemented in this PR, that is kokkos_tools_{help,libs,args}

[masterleinad]

Fine with me (as well as both libraries and arguments).

[ldh4]

My recollection from the dev meeting was we keep the name as they are currently implemented in this PR, that is kokkos_tools_{help,libs,args}

That's what I recall as well.