#139 - added EthToWei conversion

[abdulowork]

As per #139

• added an EthToWei to be able to convert a whole eth amount to a wei amount

[0crat]

Job #140 is now in scope, role is REV

[codecov-io]

Codecov Report

Merging #140 into develop will decrease coverage by 0.16%.
The diff coverage is 52.77%.

@@             Coverage Diff             @@
##           develop     #140      +/-   ##
===========================================
- Coverage    96.62%   96.46%   -0.17%     
===========================================
  Files          296      298       +2     
  Lines         9779     9815      +36     
===========================================
+ Hits          9449     9468      +19     
- Misses         330      347      +17

Impacted Files	Coverage Δ
Example/Tests/NumberScalar/EthToWeiTests.swift	100% <100%> (ø)
Web3Swift/NumberScalar/EthToWei.swift	32% <32%> (ø)

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[rockfridrich]

Let's create something like Eth, GWei, Wei, NoEther that can be converted to Wei, hex and Decimal and can be constructed from Wei and Decimal

[abdulowork]

I think it might be a good idea to add si prefixes

[abdulowork]

We also need a DoubleScalar such that you could create EthToWei(amount: 1.1)

[abdulowork]

Lets do this one later