new(falco): add buffer_format_base64 option, deprecate -b #3050

Job	Run time
fetch-version / fetch-version	27s
build-dev-minimal / build-and-test	5m 4s
build-dev / build-and-test	12m 56s
build-dev-minimal-arm64 / build-and-test	6m 54s
build-dev-packages-arm64 / build-macos-package	0s
build-dev-packages-arm64 / build-modern-bpf-skeleton	4m 55s
build-dev-packages-arm64 / build-wasm-package	0s
build-dev-packages-arm64 / build-musl-package	0s
build-dev-packages-arm64 / build-win32-package	0s
build-dev-packages-sanitizers-x86_64 / build-macos-package	6m 43s
build-dev-packages-sanitizers-x86_64 / build-modern-bpf-skeleton	2m 15s
build-dev-packages-sanitizers-x86_64 / build-musl-package	0s
build-dev-packages-sanitizers-x86_64 / build-win32-package	10m 38s
build-dev-packages-x86_64 / build-macos-package	7m 41s
build-dev-packages-sanitizers-x86_64 / build-wasm-package	5m 54s
build-dev-packages-x86_64 / build-modern-bpf-skeleton	1m 43s
build-dev-packages-x86_64 / build-musl-package	0s
build-dev-packages-x86_64 / build-wasm-package	7m 5s
build-dev-packages-x86_64 / build-win32-package	10m 34s
build-dev-packages-x86_64 / build-packages	28m 39s
build-dev-packages-sanitizers-x86_64 / build-packages	17m 58s
build-dev-packages-arm64 / build-packages	24m 21s
check-engine-version	3s
check-engine-checksum	4s
test-dev-packages / test-packages	5m 11s
test-dev-packages-arm64 / test-packages	4m 26s
	2h 43m 31s

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