exporter: support hosts and paths as binary or list strings

[tsloughter]

No description provided.

[codecov]

Codecov Report

Merging #301 (9b25285) into main (2170a84) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main     #301   +/-   ##
=======================================
  Coverage   37.27%   37.27%           
=======================================
  Files          46       46           
  Lines        3262     3262           
=======================================
  Hits         1216     1216           
  Misses       2046     2046           

Flag	Coverage Δ
api	65.14% <ø> (ø)
elixir	14.41% <ø> (ø)
erlang	37.27% <50.00%> (ø)
exporter	19.75% <50.00%> (ø)
sdk	76.58% <ø> (ø)

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Impacted Files	Coverage Δ
...ntelemetry_exporter/src/opentelemetry_exporter.erl	77.03% <50.00%> (ø)

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