feat: support fetch headers and transactions

[TheWaWaR]

Changes

• Add rpc methods
  • fetch_header
  • fetch_transaction
  • remove_headers
  • remove_transactions
• Add SendTransactionsProofProcess handle SendTransactionsProof message
• Add tests

[codecov-commenter]

Codecov Report

Base: 68.08% // Head: 70.54% // Increases project coverage by +2.46% :tada:

Coverage data is based on head (49cb60b) compared to base (80356bb). Patch coverage: 81.53% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #70 +/- ## =========================================== + Coverage 68.08% 70.54% +2.46% =========================================== Files 21 22 +1 Lines 3393 3789 +396 =========================================== + Hits 2310 2673 +363 - Misses 1083 1116 +33 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `70.54% <81.53%> (+2.46%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork) | Coverage Δ | | |---|---|---| | [...ocols/light\_client/components/send\_blocks\_proof.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3Byb3RvY29scy9saWdodF9jbGllbnQvY29tcG9uZW50cy9zZW5kX2Jsb2Nrc19wcm9vZi5ycw==) | `0.00% <0.00%> (ø)` | | | [src/subcmds.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3N1YmNtZHMucnM=) | `0.00% <0.00%> (ø)` | | | [src/protocols/light\_client/peers.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3Byb3RvY29scy9saWdodF9jbGllbnQvcGVlcnMucnM=) | `75.68% <68.38%> (-1.09%)` | :arrow_down: | | [src/protocols/light\_client/mod.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3Byb3RvY29scy9saWdodF9jbGllbnQvbW9kLnJz) | `72.50% <78.89%> (+4.64%)` | :arrow_up: | | [src/service.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3NlcnZpY2UucnM=) | `65.14% <92.30%> (+3.02%)` | :arrow_up: | | [...light\_client/components/send\_transactions\_proof.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3Byb3RvY29scy9saWdodF9jbGllbnQvY29tcG9uZW50cy9zZW5kX3RyYW5zYWN0aW9uc19wcm9vZi5ycw==) | `97.82% <97.82%> (ø)` | | | [...otocols/filter/components/block\_filters\_process.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3Byb3RvY29scy9maWx0ZXIvY29tcG9uZW50cy9ibG9ja19maWx0ZXJzX3Byb2Nlc3MucnM=) | `81.19% <100.00%> (ø)` | | | [src/storage.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3N0b3JhZ2UucnM=) | `93.79% <100.00%> (+0.65%)` | :arrow_up: | | [src/verify.rs](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#diff-c3JjL3ZlcmlmeS5ycw==) | `90.47% <100.00%> (ø)` | | | ... and [3 more](https://codecov.io/gh/nervosnetwork/ckb-light-client/pull/70/diff?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork)

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[yangby-cryptape]

The "always_success" binary in CKB is smaller than the one in this PR.