add dump subcommand which can dump all eSpace account as json file

[Pana]

This change is 

[peilun-conflux]

@peilun-conflux reviewed 19 of 19 files at r1, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @ChenxingLi)

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crates/client/src/state_dump.rs line 177 at r1 (raw file):

        let address_hash = keccak(address);

        let code = if is_contract {

Is it possible to have code or storage if is_contract is false? If not, we can add a sanity check here just in case.

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bins/conflux/src/command/dump.rs line 71 at r1 (raw file):

    fn get_state_dump_config(&self) -> Result<StateDumpConfig, String> {
        let address_str = self.start.strip_prefix("0x").unwrap_or(&self.start);

We have parse_hex_string for this.

[Pana]

Reviewable status: 15 of 23 files reviewed, 2 unresolved discussions (waiting on @ChenxingLi and @peilun-conflux)

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bins/conflux/src/command/dump.rs line 71 at r1 (raw file):

Previously, peilun-conflux wrote…

We have parse_hex_string for this.

Done.

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crates/client/src/state_dump.rs line 177 at r1 (raw file):

Previously, peilun-conflux wrote…

Is it possible to have code or storage if is_contract is false? If not, we can add a sanity check here just in case.

Add log for this case