feat: add Pancakeswap v3 Substreams module (#178)

* feat: Add Pancakeswap V3 Substreams module

At this point it's just hard copy of Uniswap V3. It will be adapted in the following commits to make reviewing easier.

* refactor: adapt uniswapv3 module logic for pancakeswap v3

The main change is how they handle protocol fees. Protocol fees are set by default depending on the fee of the pool.

* refactor: use new protobuf structs

The "EntityChanges" got deprecated in favor of the hybrid messages. This commit makes PancakeswapV3 module use the new structs.

* fix: set correct factory address

---------

Co-authored-by: zizou <111426680+flopell@users.noreply.github.com>
Co-authored-by: Louise Poole <louise@datarevenue.com>

substreams/ethereum-pancakeswap-v3/build.rs

@@ -0,0 +1,12 @@
+use anyhow::{Ok, Result};
+use substreams_ethereum::Abigen;
+
+fn main() -> Result<(), anyhow::Error> {
+    Abigen::new("Factory", "abi/Factory.json")?
+        .generate()?
+        .write_to_file("src/abi/factory.rs")?;
+    Abigen::new("Pool", "abi/Pool.json")?
+        .generate()?
+        .write_to_file("src/abi/pool.rs")?;
+    Ok(())
+}