More Date & Big integer encoders

[cchantep]

• Add TypedEncoder instances for T <: java.util.Date (aka Data, sql.Data and sql.Timestamp, often used with Spark data types).
• Add TypedEncoder instances for Scala & Java big integer

[codecov]

Codecov Report

Patch coverage: 96.85% and project coverage change: -0.10% ⚠️

Comparison is base (180eaf6) 95.56% compared to head (8c0489c) 95.46%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #748      +/-   ##
==========================================
- Coverage   95.56%   95.46%   -0.10%     
==========================================
  Files          67       67              
  Lines        1172     1214      +42     
  Branches       44       41       -3     
==========================================
+ Hits         1120     1159      +39     
- Misses         52       55       +3     

Flag	Coverage Δ
2.12-root-spark32	95.46% <96.85%> (-0.10%)	⬇️
2.12-root-spark33	95.46% <96.85%> (-0.10%)	⬇️
2.12-root-spark34	95.46% <96.85%> (-0.10%)	⬇️
2.13-root-spark34	96.16% <98.40%> (-0.04%)	⬇️

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Files Changed	Coverage Δ
...ataset/src/main/scala/frameless/TypedEncoder.scala	96.72% <96.85%> (-0.70%)	⬇️

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[pomadchin]

🔥 Once CI is 🟢 lets merge it!