chore: migrate bitcoin wallet snap into merged-packages/

merged-packages/bitcoin-wallet-snap/.depcheckrc.json

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+{
+  "ignores": ["@metamask/auto-changelog", "jest-transform-stub", "ts-jest"]
+}

merged-packages/bitcoin-wallet-snap/.env.example

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+# Log Level
+# Possible Options: error, warn, info, debug, trace, silent
+# Default: info
+# Required: false
+LOG_LEVEL=
+
+# Default address type
+# Possible options: p2pkh, p2sh, p2wpkh, p2wsh, p2tr
+# Default: p2wpkh
+# Required: false
+DEFAULT_ADDRESS_TYPE=
+
+# Esplora endpoint for Bitcoin network
+# Default: https://blockstream.info/api
+# Required: false
+ESPLORA_BITCOIN=
+# Esplora endpoint for Testnet network
+# Default: https://blockstream.info/testnet/api
+# Required: false
+ESPLORA_TESTNET=
+# Esplora endpoint for Testnet4 network
+# Default: https://mempool.space/testnet4/api/v1
+# Required: false
+ESPLORA_TESTNET4=
+# Esplora endpoint for Signet network
+# Default: https://mutinynet.com/api
+# Required: false
+ESPLORA_SIGNET=
+# Esplora endpoint for local regtest network
+# Default: http://localhost:8094/regtest/api
+# Required: false
+ESPLORA_REGTEST=
+
+# Price API endpoint
+# Default: https://price.api.cx.metamask.io
+# Required: false
+PRICE_API_URL=

merged-packages/bitcoin-wallet-snap/.prettierignore

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+dist/
+coverage/