Lift dependencies to the workspace (Part 1) (#2070)

Changes (partial https://github.com/paritytech/polkadot-sdk/issues/994):
- Set log to `0.4.20` everywhere
- Lift `log` to the workspace

Starting with a simpler one after seeing
https://github.com/paritytech/polkadot-sdk/pull/2065 from @jsdw.
This sets the `default-features` to `false` in the root and then
overwrites that in each create to its original value. This is necessary
since otherwise the `default` features are additive and its impossible
to disable them in the crate again once they are enabled in the
workspace.

I am using a tool to do this, so its mostly a test to see that it works
as expected.

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/client/merkle-mountain-range/Cargo.toml

@@ -16,7 +16,7 @@ workspace = true
 [dependencies]
 codec = { package = "parity-scale-codec", version = "3.6.1" }
 futures = "0.3"
-log = "0.4"
+log = { workspace = true, default-features = true }
 sp-api = { path = "../../primitives/api" }
 sp-blockchain = { path = "../../primitives/blockchain" }
 sc-client-api = { path = "../api" }