C: Optimize hb_string() to compute length at compile time

[marcoroth]

This pull request converts the hb_string() function to a macro and renames the existing hb_string function to hb_string_from_c_string.

We do this in order to optimize hb_string() calls with static string literals so that they have no runtime-overhead for converting a C-String to a hb_string_T.

This applies for calls like:

hb_string("<%")
hb_string("%>")

For dynamic strings it will fallback to hb_string_from_c_string():

hb_string(variable)
hb_string(message)

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1318

npx https://pkg.pr.new/@herb-tools/language-server@1318

npx https://pkg.pr.new/@herb-tools/linter@1318

commit: 09a9a8c

[github-actions]

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