Prepare for FlatBuffers support

[codecov-commenter]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (8066124) 77.07% compared to head (b8192e9) 73.34%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #45 +/- ## ========================================== - Coverage 77.07% 73.34% -3.73% ========================================== Files 20 20 Lines 820 848 +28 Branches 91 96 +5 ========================================== - Hits 632 622 -10 - Misses 132 167 +35 - Partials 56 59 +3 ``` | [Files](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay) | Coverage Δ | | |---|---|---| | [src/lib/client.hpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9jbGllbnQuaHBw) | `80.00% <ø> (ø)` | | | [src/lib/data\_service\_grpc.cpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9kYXRhX3NlcnZpY2VfZ3JwYy5jcHA=) | `39.39% <ø> (ø)` | | | [src/lib/manager\_impl.cpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9tYW5hZ2VyX2ltcGwuY3Bw) | `79.91% <100.00%> (ø)` | | | [src/lib/manager\_impl.hpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9tYW5hZ2VyX2ltcGwuaHBw) | `50.00% <ø> (ø)` | | | [src/lib/proto/proto\_client.cpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9wcm90by9wcm90b19jbGllbnQuY3Bw) | `90.69% <100.00%> (ø)` | | | [src/lib/proto/proto\_grpc\_server.cpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9wcm90by9wcm90b19ncnBjX3NlcnZlci5jcHA=) | `92.10% <ø> (ø)` | | | [src/lib/proto/proto\_mesg\_factory.cpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9wcm90by9wcm90b19tZXNnX2ZhY3RvcnkuY3Bw) | `90.90% <100.00%> (ø)` | | | [src/lib/proto/proto\_service.cpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9wcm90by9wcm90b19zZXJ2aWNlLmNwcA==) | `67.32% <ø> (ø)` | | | [src/lib/service.hpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9zZXJ2aWNlLmhwcA==) | `25.00% <ø> (ø)` | | | [src/lib/common\_lib.hpp](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay#diff-c3JjL2xpYi9jb21tb25fbGliLmhwcA==) | `85.71% <85.71%> (ø)` | | | ... and [2 more](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay) | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/eBay/nuraft_mesg/pull/45/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eBay)

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