feat(stdlib): remove pipeline from streamToBuffer

[dirkdev98]

Just make the code a bit easier to reason about.

[github-actions]

==== Benchmark result ====

Node.js version: 15
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    8364  ns/op
router - github path params              200000  iterations    9539  ns/op
compas validator simple                 5000000  iterations     266  ns/op
yup validator simple                     100000  iterations   13039  ns/op
fastest-validator validator simple     10000000  iterations     121  ns/op
compas validator nested                 1000000  iterations    1483  ns/op
yup validator nested                      50000  iterations   39212  ns/op
fastest-validator validator nested      2000000  iterations     555  ns/op
logger - strings                         500000  iterations    2788  ns/op
logger - objects                         500000  iterations    3389  ns/op
logger - deep objects                    500000  iterations    5955  ns/op
uuid                                    5000000  iterations     387  ns/op
uuid.isValid                           10000000  iterations     165  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                          50000000  iterations      21  ns/op

[github-actions]

==== Benchmark result ====

Node.js version: 14
Total benchmarks: 15
          Passed: 15
          Failed: 0
-----------
router - github static path              200000  iterations    7964  ns/op
router - github path params              200000  iterations    9393  ns/op
compas validator simple                 5000000  iterations     251  ns/op
yup validator simple                     100000  iterations   11617  ns/op
fastest-validator validator simple     10000000  iterations     109  ns/op
compas validator nested                 1000000  iterations    1330  ns/op
yup validator nested                      50000  iterations   35047  ns/op
fastest-validator validator nested      2000000  iterations     527  ns/op
logger - strings                         500000  iterations    2763  ns/op
logger - objects                         500000  iterations    3367  ns/op
logger - deep objects                    500000  iterations    4791  ns/op
uuid                                    5000000  iterations     471  ns/op
uuid.isValid                           10000000  iterations     156  ns/op
isNil                                 500000000  iterations       0  ns/op
isPlainObject                         100000000  iterations      18  ns/op

[github-actions]

==== C8 test coverage ====
Statements: 66.04% ( 24998/37851 )
Branches : 65.13% ( 2757 /4233 )
Functions : 66.99% ( 828 /1236 )
Lines : 66.04% ( 24998 /37851 )