feat: Add tactical support for non-native tokens as txn fees

[ameten]

Issue

Scraper fails to store a transaction to database if the transaction has fees expressed in a non-native token.

Introduction

Currently if transaction fees are expressed in a non-native token, Scraper won't store it into database since it is not capable to calculate gas price in this case.

Support only TIA and ATOM as transaction fees.

https://neutron.celat.one/neutron-1/txs/3cb9086829d44af45e914c335c877b17fe70234ab1515d128a0486ff8c47db91
https://neutron.celat.one/neutron-1/txs/d16d6ce85b4b4d30cfd25d8313607f8e24fcf04f282cbe484aaf7b38552cf069
https://neutron.celat.one/neutron-1/txs/d3a2bc17bf7dec51a2c7710e013a9af5d704676f5c872541836f7ef3159acdec

Tasks

1. Hardcode ibc/<ids>, token names and denominations for tokens seen in the Neutron chain as transaction fees Scraper has to process.
2. Add conversion of non-native tokens into 10^-18.
3. Add column into transaction table with identifier of the token for fees.