Add OTel log support to Carnot plan protos and implement exec node support #2503

Job	Run time
env-protect-setup	5s
authorize	1s
get-dev-image / get-image	7s
generate-matrix	3m 23s
clang-tidy	15m 14s
code-coverage	0s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	17m 29s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	10m 8s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	14m 51s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	12m 17s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	16m 55s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	7m 43s
build-and-test-status	1s
	1h 38m 14s

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