Automate Snapcraft remote build and deploy pipeline (implementation & release)

[internet-zero]

Based on earlier discussion and review (refer #19), a standard release strategy has been defined in the following document. The steps mentioned in the document will be implemented in this issue.

ArchEthicSnapReleaseManagement.pdf

Tasks:

• [x] Create anchor nodes for testnet and mainnet bootstrapping.
• [x] Structure archethic-snap repo into two branches - master and testnet keeping all perpetual differences intact.
• [x] Propose snap store community for adding "testnet" track and making default track "mainnet".
• [x] Add github actions in archethic-node master branch to automate snap build and deploy to mainnet/edge channel.
• [x] Add github actions in archethic-node testnet branch to automate snap build and deploy to testnet/edge channel.
• [x] Add github actions in archethic-snap master branch to automate snap build and deploy to mainnet/edge channel.
• [x] Add github actions in archethic-snap testnet branch to automate snap build and deploy to testnet/edge channel.
• [x] Completely test all github actions.

[internet-zero]

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