Make solana_account_decoder dep public in anchor client

[cryptopapi997]

Currently, anchor-client already exports solana_client and solana_sdk to make it easier for the user to not have to manually keep the version between these and anchor client in sync. Unfortunately it does not export solana_account_decoder, even though this one is used internally and is needed to instantiate certain (commonly-used) structs in solana_sdk such as RpcAccountInfoConfig. This means the user has to manually configure its version which is annoying. This can be fixed easily by exporting it too, so this PR adds that.

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[acheroncrypto]

Yeah, can do, but let me ask a quick question before we get this in: does it not work if you let cargo decide the proper version by adding it as solana-account-decoder = "*"?

[cryptopapi997]

For my current setup setting it to solana-account-decoder = "*" just makes it complain about more dependency conflicts (This obv isn't solely the fault of anchor since my repo is quite large). I currently have a workaround in place using some cargo patch stuff so this addition technically isn't 100% mandatory. I felt like it was a good change nonetheless though, as this is in line with how anchor currently handles the other solana deps & in my specific case (and I suspect other people using anchor client and wanting to use stuff from solana-account-decoder) it would make things a bit easier.

[acheroncrypto]

Thanks!