feat(qwp): support for PEM CA files (#75) #283

Job	Run time
Build, test & javadoc (JDK 8)	3m 35s
Compile & javadoc smoke (JDK 25)	36s
GLIBC floor guard (linux-x86-64)	1m 20s
GLIBC floor guard (linux-aarch64)	1m 7s
	6m 38s

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