For types that have private inner fields we would like to manually
implement `serde` traits instead of deriving them.
This hardens the crate against making future mistakes if we want to
change the inner fields.
Do so for:
- `Weight`
- `BlockTime`
- `NumberOfBlocks`
- `NumberOf512seconds`
As per policy in #4090 add a privacy boundary to the `BlockTime` type.
Use the module name `encapsulate` as is done in `amount` - its private
so the name can easily be changed later if needed.
Explicitly do not run the formatter or update rustdoc column width so
that review is easier.
We just re-named `Timestamp` to `BlockTime`. We have a `units::block`
module but it currently holds abstractions (`BlockHeight` and
`BlockInterval`) that are not onchain abstractions and therefore
somewhat different from the `BlockTime`. Instead of making `block` a
block 'utils' module instead re-name the `timestamp` module to `time`.
Tobin C. Harding
Jamil Lambert, PhD