new(falco): add buffer_format_base64 option, deprecate -b #3021

Job	Run time
fetch-version / fetch-version	28s
build-dev-minimal / build-and-test	4m 32s
build-dev / build-and-test	11m 1s
build-dev-minimal-arm64 / build-and-test	4m 45s
build-dev-packages-arm64 / build-modern-bpf-skeleton	2m 9s
build-dev-packages-arm64 / build-win32-package	0s
build-dev-packages-arm64 / build-musl-package	0s
build-dev-packages-arm64 / build-wasm-package	0s
build-dev-packages-arm64 / build-macos-package	0s
build-dev-packages-sanitizers-x86_64 / build-macos-package	5m 39s
build-dev-packages-sanitizers-x86_64 / build-modern-bpf-skeleton	1m 49s
build-dev-packages-sanitizers-x86_64 / build-musl-package	0s
build-dev-packages-sanitizers-x86_64 / build-wasm-package	5m 53s
build-dev-packages-sanitizers-x86_64 / build-win32-package	10m 29s
build-dev-packages-x86_64 / build-macos-package	5m 48s
build-dev-packages-x86_64 / build-modern-bpf-skeleton	1m 44s
build-dev-packages-x86_64 / build-musl-package	0s
build-dev-packages-x86_64 / build-wasm-package	7m 1s
build-dev-packages-x86_64 / build-win32-package	10m 49s
build-dev-packages-x86_64 / build-packages	20m 33s
build-dev-packages-sanitizers-x86_64 / build-packages	17m 13s
build-dev-packages-arm64 / build-packages	16m 4s
check-engine-version	6s
check-engine-checksum	4s
test-dev-packages-arm64 / test-packages	2m 11s
test-dev-packages / test-packages	5m 8s
	2h 13m 26s

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