Add support for proxy contracts in fuels deploy

[arboleya]

Intro

It goes like this:

[proxy]
enabled = true

Docs:

• https://docs.fuel.network/docs/forc/plugins/forc_client/#proxy-contracts

Tips

We currently have this helper:

fuels-ts/packages/fuels/src/cli/config/forcUtils.ts

Line 35 in 751d638

export function readForcToml(path: string) {

It is used here, but the toml contents get discarded when the method finishes:

fuels-ts/packages/fuels/src/cli/config/loadConfig.ts

Line 92 in 56018e3

const forcToml = readForcToml(workspace);

The final touch will probably have to be around here:

fuels-ts/packages/fuels/src/cli/commands/deploy/deployContract.ts

Line 28 in 8faeaa4

const { waitForResult } = await contractFactory.deploy(deployConfig);

Ultimately, we should probably persist the TOML contents with the other artifacts.

Notes

I wonder if it'd be a good moment to address this issue together with:

• Typegen - Account for program types automatically #989

[danielbate]

The behaviour of the deployment depends on the existence of both the proxy table and the enabled and address flags. I've created the following decision tree to illustrate the process: