Internationalize dsc_lib

[SteveL-MSFT]

PR Summary

• move all strings used in dsc_lib to a localizable file
• update some tests due to string changes
• added i18n test to verifies all use of t!() macro finds a corresponding entry in toml file since it's case sensitive and typos don't result in build error, also verifies that all entries in toml get used
• fix brew example as macOS is lowercase

All future PRs should include i18n for strings. Usage with parameters looks like this:

[parser]
parsingStatement = "Parsing statement: %{statement}"

used as:

debug!("{}", t!("parser.statement.parsingStatement", statement = statement));

Where when using the trace macros, you must have the first arg as "{}" as the t!() macro doesn't return a string that can be used directly. Then the parameter in the string is assigned the variable value.

However, if you need to use the debug rendering of a variable, then the syntax looks like:

trace!("{}", t!("dscresources.commandResource.groupGetResponse", response = &group_response : {:?}));

Where normally it would look like:

trace!("Foo {:?}", bar);

So with the t!() macro, you use the : {:?} to specify formatting rules as part of parameter replacement. All the normal formatting can be used like number of decimal places, hex, etc...