tests

feat(teler): add `CaddyHandler{,FuncWithNext}` #161

Job	Run time
tests (1.21.x)	3m 2s
license-verify	20s
tests (1.22.x)	3m 9s
codecov	2m 35s
sast	4m 52s
regression / regression (initialize)	1m 38s
regression / regression (analyze)	2m 16s
	17m 52s

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