closes#2844
- adds `list-pallets` option which prints all unique available pallets
for benchmarking
```bash
./target/release/node benchmark pallet --list=pallets
```
- adds `all` option which runs benchmarks for all available pallets and
extrinsics (equivalent to `--pallet * --extrinsic *`)
```bash
./target/release/node benchmark pallet --all
```
- use the `list=pallets` syntax in `run_all_benchmarks.sh` script
cc ggwpez
---------
Co-authored-by: Bastian Köcher <git@kchr.de>
Dastan