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kv: use LockSpanSets to declare lock spans
Prior to this patch, requests would use the same mechanism (`spanset.SpanSets`) to declare both latch and lock spans. This patch changes the latter to use `lockspanset.LockSpanSets` instead. This allows us to declare lock spans for a request with its intended lock strengths in the future. This will in-turn enable us to support multiple locking strengths in the concurrency package. This patch does not change any functionality. To that end, requests that would have previously declared access for `spanset.SpanReadOnly` use `lock.None`; requests that would have previously declared `spanset.SpanReadWrite` use `lock.Intent`. The `concurrency` package validates lock spans with no other lock strength are supplied to it. It does so both in the lock table waiter and when scanning the lock table. We will relax these assertions as we build towards shared locks. One thing to note is that I decided not to change the lock table tests in this patch, to reduce test churn. We do so by translating lock strength back to SpanAccess when printing out the guard state. This will get fixed in a followup, along with the datadriven input. Informs cockroachdb#102008 Release note: None
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