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Request metadata is now handled by buildbox-common Client.

Retry is now handled by buildbox-common Client, which uses the
buildbox-common GrpcRetrier.

Replaced by buildbox-common Client.

These metrics are recc-specific. Move them to recc.m.cpp in preparation
for the migration to buildbox-common Client.

Split part of constructor into separate `init()` methods to align with
buildbox-common Client.

Don't directly access recc env configuration in `CASClient`.

Only returning the channel loses information such as instance name and
retry configuration.

Before this commit, RECC would not guess products if there were products
explicitly named/produced by the command. This is normally fine, since
options like `-o` cannot be used when multiple outputs are produced.
However, by using options like `-MF -MD` one can explicity produce dependency
outputs while running a compilation command. This means that RECC would not
guess the compiler outputs in these situations.

This commit changes this behavior so that RECC will guess compiler outputs
even if the dependencies are explicitly written out to a file. This is done
by seperating out dependency products and non dependency
products in parsedcommandfactory.

This is in preparation of the port to buildboxcommon merklize.

That option allows specifying a log level from the list supported by
buildbox-common when `RECC_VERBOSE` is set.

This also changes the level used by default: from DEBUG to ERROR.

Due to how environment variables are resolved, and channels are
configured, it's difficult to add a cache-only mode without adding
another option.

This is because there is no way to distinguish between RECC_SERVER
unset and set to the default after variables are resolved, and when
forced in, everything assumes a remote channel is created, even if not
used, so we need an address for RECC_SERVER (or a _lot_ of reworking
of the internals).

Instead, let's create a RECC_CACHE_ONLY option. This gives users a bit
more control over this feature, too, so it's a nice to have.

Since we won't add all channels in the local-but-caching mode (since
the execution server will be undefined), this function will need
changing.

This fixes a bunch of code duplication to make this easier.

They are dependencies of buildbox-common so they are already installed
when installing buildbox-common
This also helps to keep the info in a single place instead duplicate
the instructions here and in the buildbox-common README

Use `buildboxcommon::FileUtils::createDirectory()` instead.