feat(bindings-ts)!: API change: return `AssembledTransaction`s, require signAndSend, and support multi-auth workflows #2921

Job	Run time
Unit tests (ubuntu-20.04, 1.20.1)	5m 10s
Integration tests (ubuntu-20.04, 1.20.1, .CLI.)	10m 57s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 23s
Integration tests (ubuntu-20.04, 1.20.1, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	12m 42s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	3m 10s
Build (macos-latest, x86_64-apple-darwin, amd64)	5m 18s
Build (macos-latest, aarch64-apple-darwin, arm64)	7m 18s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	6m 2s
	53m 0s

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