refactor: validate `Fdt` on construction (#23) #305

Job	Run time
Cargo check	19s
Code formatting checks	19s
Machete dependencies checks	1m 1s
Minimal dependency versions build	19s
Clippy lint checks	22s
Build with each feature combination	28s
Build & test (stable, macos-latest)	31s
Build & test (stable, ubuntu-latest)	17s
Build & test (nightly, ubuntu-latest)	24s
Build & test (1.88, macos-latest)	44s
Build & test (1.88, windows-latest)	50s
Build & test (stable, windows-latest)	50s
Build & test (1.88, ubuntu-latest)	25s
Build & test (nightly, windows-latest)	1m 5s
Build & test (nightly, macos-latest)	39s
Miri test	1m 11s
	9m 44s

Provide feedback