SDK / exoplayer

- We had buildAddRequest and sendNewDownload. Converged to
  buildAddDownload and sendAddDownload.
- Also fixed a few more inconsistencies, and brought the
  action constants into line as well.

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- Listener based reporting of progress allows the content length
  to be persisted into the download index (and notified via a
  download state change) as soon as it's available.
- Moved contentLength back into Download proper. It should only
  ever change once, so I'm not sure it belongs in the mutable part
  of Download.
- Made a DownloadProgress class, for naming sanity.

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Assuming there is no text language preference.

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1. customCacheKey for DASH/HLS/SS is now asserted against
   in DownloadRequest
2. Merging of event delivery in DownloadManager is very
   tricky to get right and probably not a good idea

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Currently SimpleCache will touch cache spans whenever it reads
from them. With legacy SimpleCache setups this involves a potentially
expensive file rename. With new SimpleCache setups it involves
a more efficient but still non-free database write.

For offline use cases, and more generally any use case where the
eviction policy doesn't use last access timestamps, touching is
not useful. This change allows the evictor to specify whether it
needs cache spans to be touched or not. SimpleCache will only touch
spans if the evictor requires it.

Note: There is a potential change in behavior in cases where a
cache uses an evictor that doesn't need cache spans to be touched,
but then later switches to an evictor that does. The new evictor
may temporarily make sub-optimal eviction decisions as a result.
I think this is a very fair trade-off, since this scenario is
unlikely to occur much, if at all, in practice, and even if it
does occur the result isn't that bad.
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Issue: #5772
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One goal we forgot about a little bit was to allow applications
to provide their own index implementation. This requires the
writable side to also be defined by an interface.

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ImaAdsLoader gets the player position after the app releases
the player to support resuming ads at their current position
if the same ads loader is reused.

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We currently do manual position tracking while the player is in error mode.
This is to allow an initial seek to the new position when trying to re-prepare.

Instead, we can just use our player.retry method and remove the tracking code.

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The removed condition only applies when prepare fails and no timeline was or
is known. We should keep a pending seek position in such a case. The internal
player does the same thing already.

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Issue: #5767
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- It can work with any DownloadIndex
- Also simplify things to not require that it's registered
  as a DownloadManager listener by someone else

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- Expose constructors that take DatabaseProvider. Deprecate those
  that do not.
- Expose Cache.getUid. This will likely be used for naming of the
  tables accessed by DefaultDownloadIndex .

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- Allows enforcing immutability, which in a future CL will allow
  avoiding allocating a new array/list on every call.
- Also some left over doc cleanup from the DownloadState rename.

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ISSUE: #4563
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