fmt: implement wrapping function's super long arguments (fix #15545, #21643)

[yuyi98]

This PR implement wrapping function's super long arguments (fix #15545, fix #21643).

• Implement wrapping function's super long arguments.

• Add test.

• vlib\v\fmt\tests\fn_with_long_args_keep.vv

fn process_keyholder1(super_long_argument1 string, super_long_argument2 string, super_long_argument3 string,
	super_long_argument4 string, super_long_argument5 string) string {
	return ''
}

fn process_keyholder2(super_long_argument1 string, super_long_argument2 string, super_long_argument3 string,
	super_long_argument4 string, super_long_argument5 string, super_long_argument6 string, super_long_argument7 string,
	super_long_argument8 string) string {
	return ''
}

fn main() {}

[spytheman]

That is shorter than 140 characters (127), why is it still wrapped?

[yuyi98]

Here is in accordance with the non-last parameter length more than 90.

[spytheman]

that got wrapped, but the second line is also very long

[yuyi98]

It was not considered that there would be such a long parameter, I'll fix it.

[yuyi98]

fn (mut tm DynamicTemplateManager) create_template_cache_and_display(tcs CacheRequest, last_template_mod i64,
	unique_time i64, file_path string, tmpl_name string, cache_delay_expiration i64, placeholders &map[string]DtmMultiTypeMap,
	current_content_checksum string, tmpl_type TemplateType) string {

[JalonSolov]

If it's going to wrap arguments because of a too-long line, I'd almost rather see it add a newline after every argument, and line them all up.

This would mean

fn process_keyholder1(super_long_argument1 string, super_long_argument2 string, super_long_argument3 string,
	super_long_argument4 string, super_long_argument5 string) string {
	return ''
}

fn process_keyholder2(super_long_argument1 string, super_long_argument2 string, super_long_argument3 string,
	super_long_argument4 string, super_long_argument5 string, super_long_argument6 string, super_long_argument7 string,
	super_long_argument8 string) string {
	return ''
}

would be turned into

fn process_keyholder1(super_long_argument1 string,
	super_long_argument2 string,
	super_long_argument3 string,
	super_long_argument4 string,
	super_long_argument5 string) string {
	return ''
}

fn process_keyholder2(super_long_argument1 string,
	super_long_argument2 string,
	super_long_argument3 string,
	super_long_argument4 string,
	super_long_argument5 string,
	super_long_argument6 string,
	super_long_argument7 string,
	super_long_argument8 string) string {
	return ''
}

which, to me, is much more readable than the multiple lines of arbitrary numbers of arguments. Just compare what you see above.