feat: Implement `Sourcer` traits for serving source (#2301) #1257

Job	Run time
Build binaries	7m 48s
build-rust-amd64	6m 22s
build-rust-arm64	6m 29s
Build & push linux/amd64 and linux/arm64 (numaflow)	2m 23s
Bom	59s
Release	21s
	24m 22s

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