chore: refactor code to reduce object creations (#172) #789

Job	Run time
units (8)	44s
units (11)	41s
units (21)	36s
clirr	38s
windows	1m 11s
javadoc	51s
dependencies (17)	44s
units (17)	43s
integration / integration-cassandra (11)	3m 6s
integration / integration-spanner (11)	6m 41s
lint	38s
	16m 33s

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