Builders as functions

[lostintime]

ObservableInstance is now Observable
Old Observble static methods moved to separate module as functions

It can be now used as:

import * as Mx from "monix-reactive"

const stream: Mx.Observable<number> = Mx.pure(10).pipe(Mx.id)

May resolve #10

[codecov]

Codecov Report

Merging #12 into master will decrease coverage by 0.29%.
The diff coverage is 94.44%.

@@            Coverage Diff            @@
##           master      #12     +/-   ##
=========================================
- Coverage   89.51%   89.21%   -0.3%     
=========================================
  Files          15       14      -1     
  Lines         267      269      +2     
  Branches       36       36             
=========================================
+ Hits          239      240      +1     
- Misses         28       29      +1

Impacted Files	Coverage Δ
...es/monix-reactive/src/internal/subscribers/safe.ts	71.15% <ø> (ø)	⬆️
...es/monix-reactive/src/internal/subscribers/wrap.ts	94.44% <ø> (ø)	⬆️
packages/monix-reactive/src/internal/ack-utils.ts	94.11% <ø> (ø)	⬆️
packages/monix-reactive/src/builders.ts	100% <100%> (ø)
...ages/monix-reactive/src/internal/builders/never.ts	100% <100%> (ø)	⬆️
...kages/monix-reactive/src/internal/builders/eval.ts	92.1% <100%> (ø)	⬆️
...kages/monix-reactive/src/internal/builders/pure.ts	100% <100%> (ø)	⬆️
...ages/monix-reactive/src/internal/builders/empty.ts	100% <100%> (ø)	⬆️
...ages/monix-reactive/src/internal/builders/array.ts	88.57% <100%> (ø)	⬆️
packages/monix-reactive/src/index.ts	100% <100%> (ø)	⬆️
... and 3 more

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