Feature/#40 add moshi type adapters

[biafra23]

Closes #40 .

Changes proposed in this pull request:

• Adds JSON adapters for addresses and Wei values
• Creates a default builder that can be modified by clients if they need additional TypeAdapters
• String.parseToBigInteger() has been added to NumberUtils and can be removed from StringUtils in the app

At the moment these Adapters are not used in the gnosis-safe-android app. And the legacy app does not support the changes made in v0.11.0

@gnosis/mobile-devs

[codecov-io]

Codecov Report

Merging #44 into master will increase coverage by 0.17%. The diff coverage is 65.21%.

@@             Coverage Diff              @@
##             master      #44      +/-   ##
============================================
+ Coverage     60.08%   60.25%   +0.17%     
  Complexity      154      154              
============================================
  Files            54       55       +1     
  Lines          1378     1394      +16     
  Branches        231      230       -1     
============================================
+ Hits            828      840      +12     
- Misses          433      436       +3     
- Partials        117      118       +1     

Impacted Files	Coverage Δ	Complexity Δ
...ava/pm/gnosis/common/adapter/moshi/TypeAdapters.kt	63.63% <63.63%> (ø)	0.00 <0.00> (?)
utils/src/main/java/pm/gnosis/utils/NumberUtils.kt	93.75% <100.00%> (+0.41%)	0.00 <0.00> (ø)
...m/gnosis/svalinn/accounts/base/models/Signature.kt	75.00% <0.00%> (-1.48%)	4.00% <0.00%> (ø%)
...sis/svalinn/security/impls/AesEncryptionManager.kt	73.94% <0.00%> (-0.22%)	24.00% <0.00%> (ø%)
...pto/src/main/java/pm/gnosis/crypto/utils/Curves.kt	100.00% <0.00%> (ø)	3.00% <0.00%> (ø%)
...rc/main/java/pm/gnosis/crypto/LinuxSecureRandom.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...gnosis/svalinn/security/impls/AndroidKeyStorage.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)

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[jpalvarezl]

LGTM