feat: Check if network is mainnet or testnet depending on env

[ChaituVR]

• Add a new keyword snapshotKeyword to check if the network exists in networks.json or not
• If snapshot's env is mainnet it will check only mainnet networks
• if snapshot's env is testnet it will check only testnet networks

To Do:

• On UI and sequencer, need to update validateSchema function to pass the env in the third optional param

validateSchema(schema, data, { snapshotEnv: 'mainnet' })

[wa0x6e]

Why don't we default to mainnet ?

[ChaituVR]

We now support all networks 🙈 so i thought it is the default case

we can change it later because,
If we make mainnet default, then we need to change the sequencer code before merging this, else demo.snapshot.org will also accept only mainnet networks
Also, UI still displays all networks.

[wa0x6e]

So everything works like before, without the 3rd param ?

[ChaituVR]

Yep should work

[samuveth]

utACK

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6be303e) 44.19% compared to head (e9c4053) 44.96%.

Files	Patch %	Lines
src/utils.ts	94.44%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #936      +/-   ##
==========================================
+ Coverage   44.19%   44.96%   +0.76%     
==========================================
  Files          22       22              
  Lines        2100     2133      +33     
  Branches      195      200       +5     
==========================================
+ Hits          928      959      +31     
- Misses       1162     1164       +2     
  Partials       10       10              

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