* Move `init_tracing` to `lib.rs`
Allow it to be reused by other binaries.
* Fix `hex` dependency inclusion in `zebra-chain`
It would previously fail because `hex` was being included without the
`serde` feature, even though we required that for `transparent::Script`.
* Implement `FromStr` for `Network`
Make it easy to receive it as a command-line parameter.
* Add `zebra-tip-height` utility
Obtains the chain tip height of a directory containing Zebra state.
* Remove Tokio dependency from `zebra-utils`
It wasn't actually used by the `zebra-tip-height` utility.
* Remove `BoxStateService` type alias
It's not needed if we don't return the unused state service. This also
allows removing the `tower` dependency.
* Remove unnecessary attribute
Leftover from copied code.
* Make `cache_dir` argument optional
Fallback to the default Zebra state cache directory.
* Remove added newline
Minor formatting fix, to avoid adding an unnecessary newline.
* Move `tip-height` command into `zebrad`
Make it available as a sub-command in `zebrad`.
* Make some zebrad sub-commands only log warnings
Co-authored-by: teor <teor@riseup.net>
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