go: Define a bytePool for TRichTransport #1616

Job	Run time
compiler (ubuntu-20.04)	2m 56s
compiler (ubuntu-22.04)	2m 31s
lib-php (7.1)	1m 13s
lib-php (7.2)	1m 2s
lib-java-kotlin	3m 59s
lib-php (7.3)	1m 2s
lib-python (3.x)	1m 37s
lib-go (1.21)	1m 34s
lib-php (7.4)	1m 0s
lib-go (1.22)	1m 35s
lib-rust	3m 25s
lib-php (8)	1m 15s
lib-swift	1m 9s
lib-php (8.1)	1m 0s
lib-php (8.2)	1m 6s
lib-php (8.3)	1m 3s
cross-test (java, java,kotlin)	1m 42s
cross-test (java, go,rs)	1m 51s
cross-test (java, swift)	32s
cross-test (kotlin, java,kotlin)	52s
cross-test (kotlin, go,rs)	25s
cross-test (kotlin, swift)	27s
cross-test (go, java,kotlin)	47s
cross-test (go, go,rs)	46s
cross-test (go, swift)	49s
cross-test (rs, java,kotlin)	35s
cross-test (rs, go,rs)	35s
cross-test (rs, swift)	48s
cross-test (swift, java,kotlin)	28s
cross-test (swift, go,rs)	58s
cross-test (swift, swift)	28s
	39m 30s

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