[rpc] add raw field into BlockView to support get raw block

[coldnight]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: #3479

What is the new behavior?

• Add raw field into GetBlockOption to support specify it to get raw block
• Add optional raw field into BlockView and fill it when above field is set to true.

Other information

[codecov]

Codecov Report

Merging #3489 (2bfd6f9) into master (baae183) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3489      +/-   ##
==========================================
- Coverage   30.98%   30.93%   -0.05%     
==========================================
  Files         500      500              
  Lines       46806    46828      +22     
  Branches    22109    22122      +13     
==========================================
- Hits        14497    14480      -17     
- Misses      17978    18097     +119     
+ Partials    14331    14251      -80     

Flag	Coverage Δ
unittests	30.93% <0.00%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rpc/api/src/chain/mod.rs	12.50% <0.00%> (-0.54%)	⬇️
rpc/api/src/types.rs	14.02% <0.00%> (+0.35%)	⬆️
rpc/server/src/module/chain_rpc.rs	3.40% <0.00%> (-0.07%)	⬇️
rpc/server/src/module/pubsub.rs	34.47% <0.00%> (-0.10%)	⬇️
consensus/src/consensus.rs	39.69% <0.00%> (-15.87%)	⬇️
vm/types/src/language_storage_ext.rs	37.50% <0.00%> (-12.50%)	⬇️
network-p2p/src/transport.rs	15.10% <0.00%> (-11.32%)	⬇️
vm/types/src/on_chain_config/vm_config.rs	35.00% <0.00%> (-10.00%)	⬇️
cmd/starcoin/src/cli_state.rs	39.03% <0.00%> (-9.75%)	⬇️
...ccount_config/resources/module_upgrade_strategy.rs	34.29% <0.00%> (-8.57%)	⬇️
... and 76 more

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[jolestar]

LGTM