rename `Reader` types to `ByteSource` (e.g. `IoReader` to `IoByteSource`) #240

Job	Run time
Build Examples	13s
Check subtrees are up to date	3s
ESP Examples (esp32c3-power-meter-mock, build, --release)	35s
Check	5s
ESP Examples (esp32c3-power-meter-mock, build, --release --all-features)	36s
Lints	33s
Semver Checks	26s
ESP Examples (esp32c3-power-meter-mock, fmt, --all -- --check --color always)	13s
Test Suite	53s
ESP Examples (esp32c3-power-meter-mock, clippy, --all-features --workspace -- -D warnings)	36s
ESP Examples (esp32c3-sml-reader, build, --release)	47s
ESP Examples (esp32c3-sml-reader, build, --release --all-features)	51s
ESP Examples (esp32c3-sml-reader, fmt, --all -- --check --color always)	21s
ESP Examples (esp32c3-sml-reader, clippy, --all-features --workspace -- -D warnings)	49s
ESP Examples (esp32c3-sml-reader-async, build, --release)	38s
ESP Examples (esp32c3-sml-reader-async, build, --release --all-features)	41s
ESP Examples (esp32c3-sml-reader-async, fmt, --all -- --check --color always)	14s
ESP Examples (esp32c3-sml-reader-async, clippy, --all-features --workspace -- -D warnings)	37s
	9m 11s

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