soroban-cli: add flag for fiddling with the fudge factor

[kalepail]

What problem does your feature solve?

We now have the ability to modify the simulation fudge factor but the CLI doesn't expose it. This would allow for that

What alternatives are there?

Use the JS SDK which has added this feature

[kalepail]

cc: @mollykarcher @janewang

[janewang]

@tyvdh @leighmcculloch Thanks for opening this. Will the fudge factor eventually going away once there is more accurate gas estimation?

[2opremio]

I think that the fudge factor will stay for now (probably even with more accurate estimations)

[2opremio]

BTW, isn't this a duplicate of https://github.com/stellar/soroban-tools/issues/1130 ?