SBP: Give indexes to you pallets

[NachoPal]

It is a good practice to give indexes to your runtime pallets.

More info here: https://substrate.stackexchange.com/questions/1163/whats-the-logic-behind-polkadots-choice-in-pallet-indexing

[tehsunnliu]

Hello Nacho,
Thank you for your feedback. We will resolve all the issues that you have created asap.

[swowk]

cc @ytqaljn

[ytqaljn]

Thank you for your comments. Our team will discuss about the index range of the substrate pallet we quote, the index range of our own unique pallet, and the appropriate size of our reserved space

[ytqaljn]

We have added indexes for all runtime pallets:
style: runtime pallets indexing (#57)