[docs] Document gas fee estimation process

[awelc]

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We have been getting questions on our social channels on gas fee estimation and we should have it documented somewhere. If this is already done, let's have a link here so that it's searchable in the issues. Preliminarily assigning @oxade to it as our guru in this space.

[oxade]

Working on this. Will sync with @randall-Mysten on how to best document estimation.

[awelc]

@oxade, any update on this?

[oxade]

@awelc yes. @sblackshear believes we should just point folks to https://docs.sui.io/sui-jsonrpc#sui_dryRunTransaction for now. When the estimators are fleshed out, we can elaborate on the docs. So for now I can at most add a couple lines in the docs saying how to use dry run approach.

[awelc]

So for now I can at most add a couple lines in the docs saying how to use dry run approach.

I think it would be worthwhile. If possible, please close this issue once these couple of lines are added.