EitherT: add .value()

[istonikula]

Adds .value() shorthand for .fix().value, similar to what Id currently has.

[codecov]

Codecov Report

Merging #837 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #837      +/-   ##
============================================
- Coverage     44.44%   44.41%   -0.03%     
  Complexity      633      633              
============================================
  Files           294      294              
  Lines          7459     7459              
  Branches        834      834              
============================================
- Hits           3315     3313       -2     
- Misses         3843     3844       +1     
- Partials        301      302       +1

Impacted Files	Coverage Δ	Complexity Δ
...e/arrow-data/src/main/kotlin/arrow/data/EitherT.kt	44.44% <0%> (-1.02%)	4 <0> (ø)
...es-data/src/main/kotlin/arrow/instances/eithert.kt	64.7% <0%> (-2.61%)	0% <0%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c77e680...8664ff9. Read the comment docs.

[nomisRev]

Thanks for your contribution! @istonikula 🍻