chore: implementing new osnap plugin that allows tenderly simulations of proposed transactions

[cmagan]

Background

the only action needed would be to update the plugins value in the snapshot text record as shown below

Current:
{
"plugins": {
"safeSnap": {
"safes": [
{
"network": "1",
"umaAddress": "0x85f520D59deBD4c2902BB7f79ACbc3Dd4b5AB699"
}
]
}
}
}

Updated:
{
"plugins": {
"oSnap": {}
}
}

Details

A clear and concise description of what you want to happen.

Acceptance criteria

A list of tasks that need to be done for the issue to be considered resolved.