go: Define a bytePool for TRichTransport #1613

Job	Run time
compiler (ubuntu-20.04)	2m 37s
compiler (ubuntu-22.04)	1m 58s
lib-swift	1m 19s
lib-go (1.21)	1m 31s
lib-go (1.22)	1m 30s
lib-java-kotlin	4m 3s
lib-php (7.1)	56s
lib-python (3.x)	1m 24s
lib-php (7.2)	1m 0s
lib-php (7.3)	1m 0s
lib-rust	3m 20s
lib-php (7.4)	1m 0s
lib-php (8)	53s
lib-php (8.1)	1m 31s
lib-php (8.2)	1m 3s
lib-php (8.3)	1m 2s
cross-test (java, java,kotlin)	1m 55s
cross-test (java, go,rs)	1m 22s
cross-test (java, swift)	48s
cross-test (kotlin, java,kotlin)	51s
cross-test (kotlin, go,rs)	49s
cross-test (kotlin, swift)	24s
cross-test (go, java,kotlin)	39s
cross-test (go, go,rs)	1m 8s
cross-test (go, swift)	49s
cross-test (rs, java,kotlin)	51s
cross-test (rs, go,rs)	44s
cross-test (rs, swift)	56s
cross-test (swift, java,kotlin)	45s
cross-test (swift, go,rs)	1m 4s
cross-test (swift, swift)	23s
	39m 35s

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