Breaking change - top level API - log levels

[muir]

The expectation is that the new "Log" level will be the default level people use.

Adding "Log()" as a level, created a conflict with the "Log()" that is used to create loggers, so the top-level logger changed from "Log" to "Logger".

That creates a name conflict that is not resolved with xopbase.Logger, the lower level logger ("exporter" in OTEL vocab).

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (7570833) 76.93% compared to head (bdedc7c) 76.95%.

Files	Patch %	Lines
logger.go	93.62%	11 Missing and 2 partials ⚠️
sub.go	86.95%	2 Missing and 1 partial ⚠️
span.go	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   76.93%   76.95%   +0.01%     
==========================================
  Files          68       68              
  Lines       11195    11204       +9     
==========================================
+ Hits         8613     8622       +9     
  Misses       2065     2065              
  Partials      517      517              

Flag	Coverage Δ
go_tests	76.95% <93.75%> (+0.01%)	⬆️

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