panic at SpinnerLogSink.AddValues() and potentially logger.WithValues()

[Tim Swanson]

Describe the bug

For logger method WithValues() and SpinnerLogSink.AddValues() the values array is not checked nor allocated prior to attempting to assign to specific indices. This causes a panic that looks like:

panic: runtime error: index out of range [0] with length 0�[0m�[39m
goroutine 1 [running]:�[0m�[39m
github.com/banzaicloud/operator-tools/pkg/logger.(*SpinnerLogSink).AddValues(...)�[0m�[39m
/home/ubuntu/go/pkg/mod/github.com/banzaicloud/operator-tools@v0.28.3/pkg/logger/logsink.go:214�

Steps to reproduce the issue:

Use of SpinnerLogSink.AddValues() with non-zero len array arg.

Expected behavior

Don't crash

Screenshots

Additional context

v0.28.3
master