RPC method filtering

[LesnyRumcajs]

Summary

As an intermediary measure to run Forest without an external proxy, the daemon should implement a simple method white/blacklisting, along the lines of what is implemented in the api compare.

forest/src/tool/subcommands/api_cmd.rs

Lines 2079 to 2084 in 6174f78

	/// A filter list that allows or rejects RPC methods based on their name.
	#[derive(Default)]
	struct FilterList {
	allow: Vec<String>,
	reject: Vec<String>,
	}

It should allow for basic method enabling/disabling. For example, running forest with --rpc-method-filter list.txt which contains !Filecoin.ChainExport should disallow calling such method.

A sample list should be provided that disables such methods.

Completion Criteria

• A mechanism to enable/disable methods in Forest daemon is implemented,
• Unit and integration tests are in place,
• User-facing documentation (for the flag, list format) along with example usage is present.

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