bug: missing title and body max length on proposal

[wa0x6e]

On the proposal, there's no max limit set on the length of the title, body and discussion field.

This will:

• fail on offchain, as sequencer will throw an error
• process and submit the tx as valid on onchain, but will fail to index on checkpoint

Solution: we should set a common max limit (onchain/offchain) on all fields

Tasks

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1. fix: show error on Editor composer textarea #520
   +0
2. fix: validate the proposal creation form #524
   +0

[wa0x6e]

This also need to take into account turbo spaces

[wa0x6e]

I think this fix will also enable #83