Support base64 encoded files as arguments (fixes linux ulimit issues)

[TrevorJTClarke]

Is your feature request related to a problem? Please describe.
On linux, submitting long args list using -base64 flag can actually require more bytes than are allowed by system. It is not possible to sign transactions without a different approach (similar to deploying wasm)

Describe the solution you'd like
See the following line:

• https://github.com/near/near-cli/blob/master/commands/call.js#L54

This could get upgraded to using a similar file read pattern like when deploying:

const actions = <span class="error">[transactions.deployContract(readFileSync(options.wasmFile))]</span>;

So it could be like:

const base64Args = readFileSync(options.base64File);

Describe alternatives you've considered
I have tried to utilize xargs & change the file limits, however it will not work for larger data. (im storing bytes of a smart contract for doing upgrades via DAOs)

Additional context
You can see some CLI commands we're testing:
near-daos/sputnik-dao-contract#111