Adding new Logger:log() method

[lalitb]

Changes

This is to add the Logger: Log() method for the below use-case:

  Properties attribs = {{"attrib1", 1}, {"attrib2", 2}};
  logger.log(severity, name, attribs);

where Properties class implements common::KeyValueIterable.

Similar method is supported by Traccer::StartSpan():

opentelemetry-cpp/api/include/opentelemetry/trace/tracer.h

Lines 60 to 65 in 21a441e

	nostd::shared_ptr<Span> StartSpan(nostd::string_view name,
	const common::KeyValueIterable &attributes,
	const StartSpanOptions &options = {}) noexcept
	{
	return this->StartSpan(name, attributes, NullSpanContext(), options);
	}

Also, a minor change to use full tracer namespace in logger sdk, in order to avoid including unnecessary tracer headers for logger instrumentation.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #1005 (e6c8856) into main (21a441e) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1005      +/-   ##
==========================================
+ Coverage   95.40%   95.41%   +0.02%     
==========================================
  Files         161      161              
  Lines        6833     6833              
==========================================
+ Hits         6518     6519       +1     
+ Misses        315      314       -1     

Impacted Files	Coverage Δ
...include/opentelemetry/sdk/common/circular_buffer.h	100.00% <0.00%> (+2.09%)	⬆️