Unify "NetworkSymbol" all around the codebase

[tomasklim]

NetworkSymbol can be btc, eth, sol,...

Right now, in codebase we use bunch of different naming for NetworkSymbol

• symbol
• coin
• networkSymbol
• asset
• logo
• and many more...

Some networks (Optimism, BNB Smart Chain, Base,...) have different identificator of the network (op, bsc, base) than native coin (eth, bnb, eth). We need to introduce also something like DisplaySymbol, NativeSymbol, NativeCoin,... name TBD

First step should be to try unify naming of NetworkSymbol.

Unfortunately Connect uses coin, Blockbook uses symbol, so we should stick to using symbol as we do not want to transfer data.

Refactor all occurrences in suite to

• symbol where it is mix of token symbol and network symbol
• networkSymbol where it is just network symbol

On some places we type token symbols as NetworkSymbol using as which is definitely not correct

[tomasklim]

Probably duplicated of #14725