Remove null default value from parameters that are never null

[Nevay]

Prevents having to handle null values for parameters that will never be null. Might simplifiy user implementations and removes ambiguity if the meaning of null is not obvious.

[codecov]

Codecov Report

Merging #779 (0b70cf0) into main (5a64c0d) will increase coverage by 0.11%.
The diff coverage is 33.33%.

❗ Current head 0b70cf0 differs from pull request most recent head 9e9712a. Consider uploading reports for the commit 9e9712a to get more accurate results

@@             Coverage Diff              @@
##               main     #779      +/-   ##
============================================
+ Coverage     79.53%   79.64%   +0.11%     
+ Complexity     1409     1394      -15     
============================================
  Files           160      160              
  Lines          3479     3469      -10     
============================================
- Hits           2767     2763       -4     
+ Misses          712      706       -6     

Flag	Coverage Δ
7.4	?
8.0	?
8.1	79.64% <33.33%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
src/SDK/Trace/Sampler/AlwaysOffSampler.php	100.00% <ø> (ø)
src/SDK/Trace/Sampler/AlwaysOnSampler.php	100.00% <ø> (ø)
src/SDK/Trace/Sampler/ParentBased.php	100.00% <ø> (ø)
src/SDK/Trace/Sampler/TraceIdRatioBasedSampler.php	100.00% <ø> (ø)
src/SDK/Trace/SpanBuilder.php	0.00% <0.00%> (ø)
src/SDK/Trace/SpanProcessor/BatchSpanProcessor.php	100.00% <ø> (ø)
src/SDK/Trace/SpanProcessor/NoopSpanProcessor.php	100.00% <ø> (ø)
...rc/SDK/Trace/SpanProcessor/SimpleSpanProcessor.php	100.00% <ø> (ø)
src/SDK/Trace/SpanProcessor/MultiSpanProcessor.php	100.00% <100.00%> (ø)
src/SDK/Common/Dsn/Factory.php	100.00% <0.00%> (ø)
... and 5 more

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