Add input_amount to events

[gianfra-t]

Addresses #371 and #412

Changes

• Adds the parameter input_amount to wallet_connect, amount_type and form_error events.
• We use the current amount on the form for these events. For amount_type we need to delay a few seconds to avoid the amount to just be 0 or the default. If the interaction with the form is with the tokens, then the initial default amount will be sent.
• For wallet_connect a new minimal storage is added, to avoid passing props to the context.
• For Add network_selected parameter #412, we add the the network id to the event with parameter name network_selected.

Tag manager

Adds a new variable {{DLV | input_amount}} and link it to wallet_connect, amount_type and form_error.
Adds a new variable {{DLV | network_selected}}, and link it to wallet_connect.

Tested on the preview of tag manager and all events now register this new parameter.

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[gianfra-t]

@pendulum-chain/devs let me know if you like the addition of this state, if you prefer it to be more minimal (only fromAmount) or to avoid this altogether.

Although it adds extra code, I found it less confusing than passing fromAmount to the event context.