Add support for transparent-source-only (TEX) addresses #4972

Job	Run time
Bitrot check	2m 53s
Check ZFuture build on Linux	22s
Build target wasm32-wasi	2m 52s
Latest build on ubuntu-latest	47s
Check ZFuture build on macOS	1m 42s
Latest build on windows-latest	48s
Check ZFuture build on Windows	1m 58s
Clippy (MSRV)	3m 2s
Latest build on macOS-latest	45s
Clippy (beta)	17s
Code coverage	5m 39s
Intra-doc links	3m 42s
Rustfmt	19s
protobuf consistency	2m 51s
UUID validity	3s
Test on Linux	1m 14s
Test Orchard on Linux	1m 37s
Test NU6 on Linux	1m 16s
Test on macOS	2m 21s
Test Orchard on macOS	2m 26s
Test on Windows	2m 7s
Test Orchard on Windows	1s
Test NU6 on Windows	1s
	39m 3s

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