Add in-memory Device Tree representation #88

Job	Run time
Cargo check	17s
Clippy lint checks	16s
Code formatting checks	20s
Machete dependencies checks	1m 51s
Build & test (stable, macos-latest)	23s
Build & test (nightly, macos-latest)	34s
Build & test (stable, windows-latest)	1m 23s
Build & test (stable, ubuntu-latest)	21s
Build & test (nightly, ubuntu-latest)	20s
Build & test (1.88, windows-latest)	1m 25s
Build & test (1.88, ubuntu-latest)	27s
Build & test (nightly, windows-latest)	1m 4s
Minimal dependency versions build	26s
Build & test (1.88, macos-latest)	38s
Build with each feature combination	21s
Miri test	55s
	11m 1s

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