Add context to spanstore.Writer interface

[vprithvi]

Problem - what in Jaeger blocks you from solving the requirement?

jaeger/storage/spanstore/interface.go

Lines 27 to 29 in 009b7f5

	type Writer interface {
	WriteSpan(span *model.Span) error
	}

The spanstore.Writer interface does not propagate context.

Proposal - what do you suggest to solve the problem or improve the existing situation?

Add a new WriteSpanWithContext(ctx context.Context, span *model.Span) error to propagate context.

Alternatively, we may update to WriteSpan(ctx context.Context, *model.Span) error.

Unfortunately, both of these are breaking changes. Alternatively, we may create a WriterV2 interface, and supply a converter from Writer to WriterV2. Such a converter would simply use ctx.Background() for the context parameter.

[yurishkuro]

I would vote for simply changing the signature to WriteSpan(ctx context.Context, *model.Span) error. We did the same for the Reader interface in #1038.

[jpkrohling]

Implemented via #2436