Add static methods for converting to and from wei with decimals

[Roman505050]

What was wrong?

Related to Issue #3768
Closes #3768

How was it fixed?

Add static methods for converting to and from wei with decimals

Todo:

• Clean up commit history
• Add or update documentation related to these changes
• Add entry to the release notes

Cute Animal Picture

[fselmo]

@Roman505050 can you add some basic tests here to make sure it's wired up? No need to add too much as this is done in eth-utils but just in case we break the wiring up of the method, we should have a sanity check on it. If not, someone will get around to it soon. This is lower prio but I can get this in with a basic test... thanks for the PR :)

[Roman505050]

@Roman505050 can you add some basic tests here to make sure it's wired up? No need to add too much as this is done in eth-utils but just in case we break the wiring up of the method, we should have a sanity check on it. If not, someone will get around to it soon. This is lower prio but I can get this in with a basic test... thanks for the PR :)

I think I can easily add a few basic tests, as soon as possible.

[Roman505050]

@fselmo Tests successfully added, I think MR is ready for merge.