cc/ @stormasm
# Description
i was about to start the cratification of the 0% commands and thought i
could refactor and simplify a bit the declaration of the `bits`
commands, having hopefully a simpler structure to work with the other
commands 😌
this PR:
- gives real names to all the `bits` commands, instead of `SubCommand`
- make them publicly available inside the `nu-cmd-extra` crate to
declare them through `add_extra_decls`
- move the declaration code to the top-level `mod.nu` of `nu-cmd-extra`
so that all commands can be declared there as in `default_context` in
`nu-command`
# User-Facing Changes
```
$nothing
```
# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- ⚫ `toolkit test`
- ⚫ `toolkit test stdlib`
# After Submitting
```
$nothing
```
I wanted to get the infrastructure in place for starters for our
*nu-cmd-extra* crate...
The plan is to put inside here the following commands...
* bits
* bytes
* math
I thought it would be easier to do one at a time as well as get the
nu-cmd-extra crate out there on crates.io
for this upcoming release...
Once this lands the infrastructure will be in place to move over the
other noted commands for now...
And then add other stuff we do NOT want to be in 1.0.
