Implement minting funnel in Posthog

[lukasz-zimnoch]

The scope of this issue includes implementing functionality that will send the following minting-related events to Posthog:

1. Wallet connected (Connect Wallet button clicked)
2. Deposit address generated (Generate Deposit Address button clicked)
3. Minting initiated (Bridge button clicked)
4. Wallet disconnected (Disconnect button clicked)

Additional requirements:

• The ETH address should be captured at point 1 and attached to all subsequent events. Attributing specific events to the given ETH address will allow to re-create specific user journeys
• The event generated at point 1 should contain the information about the user's TBTC balance (1e18 precision)
• The event generated at point 3 should contain the information about the deposited BTC amount (1e18 precision). This can be taken from the detected UTXO.

Relevant Discord thread

### Pull Requests
- [ ] https://github.com/threshold-network/token-dashboard/pull/739