Update file format for import/export dynamic derivations

[pgolovkin]

Proposed format

version: 1
//polkadot: "Main" [main]
//polkadot//staking: "staking" [custom]
//polkadot//governance: "governance" [custom]
//polkadot//governance//0...20: anonymous

DOD:

1. Keep backward compatability with yml file
2. Update UI (removing the only yml format support)
3. Update the logic for importing file
4. Update the logic for exporting file

[sokolova-an]

structure txt file

version: 1
vault public address: {public_address}
{derivation_path}//0...{sharded}: "{name}" [{type}] ({genesis_hash})

example:

version: 1
vault public address: 0x387aed21a43ed189c8f0d14aab6f05f715f1adfe670efa6090208ddd4efe991f
//polkadot: "Main" [main] (0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3)
//polkadot//pub: "Pub account" [pub] 
//kusama: "Main" [main] (0xb0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe)
//kusama//custom//0..5: "shard acc" [custom] 

example 2:

version: 1
vault public address: 0x387aed21a43ed189c8f0d14aab6f05f715f1adfe670efa6090208ddd4efe991f
hash - 0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3:
//polkadot: "Main" [main] 
//polkadot//pub: "Pub account" [pub] 
hash - 0xb0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe:
//kusama: "Main" [main] 
//kusama//custom//0..5: "shard acc" [custom] 

[pgolovkin]

Let's use example 2 format for now.

[stepanLav]

Status verification: ❌

What has been verified:

• Export accounts ✅
• Import accounts ❌
  Tests for DP text parser #1878

[stepanLav]

Status verification: ✅