[FEATURE] Populate and read cacheable state of template path providers

[eliashaeussler]

This PR extends the PathProvider interface by an isCacheable method. It describes the possibility of path providers to provide cached root paths. This information is used in TemplatePaths when building final root paths.

[coveralls]

Pull Request Test Coverage Report for Build 12791232068

Details

• 16 of 20 (80.0%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 93.186%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Classes/Renderer/Template/Path/GlobalPathProvider.php	0	2	0.0%
Classes/Renderer/Template/Path/TypoScriptPathProvider.php	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
Classes/Renderer/Template/Path/GlobalPathProvider.php	1	63.64%

Totals
Change from base Build 12790584286:	-0.3%
Covered Lines:	971
Relevant Lines:	1042

---

💛 - Coveralls