feat: Send progress events #444

Job	Run time
Lint	23s
Test	20s
Format	19s
Build	15s
Build binary (braintrust-setup-darwin-arm64)	38s
Build binary (braintrust-setup-linux-x64)	28s
Build binary (braintrust-setup-windows-x64)	47s
Build binary (braintrust-setup-windows-arm64)	1m 32s
Build binary (braintrust-setup-darwin-x64)	1m 23s
Build binary (braintrust-setup-linux-arm64)	21s
	6m 26s

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