Add OTel log support to Carnot plan protos and implement exec node support #2478

Job	Run time
env-protect-setup	6s
authorize	1s
get-dev-image / get-image	7s
generate-matrix	3m 28s
clang-tidy	10m 57s
code-coverage	0s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	8m 48s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	6m 54s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	9m 28s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	8m 17s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	7m 12s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	4m 50s
build-and-test-status	1s
	1h 0m 9s

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