Add SonicV2Connector::set method for int value.

[liuh-80]

Why I did it

Following config command in sonic-utility using an API does not exist in swss-common:

sudo config rate smoothing-interval 100

https://github.com/Azure/sonic-utilities/blob/e089b964ef0d38d8c691eb3e551e479c0c68dd96/config/main.py#L6548
counters_db.set('COUNTERS_DB', 'RATES:PORT', 'PORT_SMOOTH_INTERVAL', interval) <== interval is an int value.

Currently swss-common only support string value:
int64_t SonicV2Connector_Native::set(const std::string& db_name, const std::string& _hash, const std::string& key, const std::string& val, bool blocking)

How I did it

Add SonicV2Connector::set method for int value.

How to verify it

Pass all test case.
Add UT to cover new API.

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111

Description for the changelog

Add SonicV2Connector::set method for int value.

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[liuh-80]

Another PR depends on this change: sonic-net/sonic-utilities#2251

[liuh-80]

This PR need improve, because following error:

NotImplementedError: Wrong number or type of arguments for overloaded function 'SonicV2Connector_Native_set'.
Possible C/C++ prototypes are:
swss::SonicV2Connector_Native::set(std::string const &,std::string const &,std::string const &,std::string const &,bool)
swss::SonicV2Connector_Native::set(std::string const &,std::string const &,std::string const &,int const,bool)

[liuh-80]

This PR need improve, because following error:

NotImplementedError: Wrong number or type of arguments for overloaded function 'SonicV2Connector_Native_set'. Possible C/C++ prototypes are: swss::SonicV2Connector_Native::set(std::string const &,std::string const &,std::string const &,std::string const &,bool) swss::SonicV2Connector_Native::set(std::string const &,std::string const &,std::string const &,int const,bool)

This PR need improve, because following error:

NotImplementedError: Wrong number or type of arguments for overloaded function 'SonicV2Connector_Native_set'. Possible C/C++ prototypes are: swss::SonicV2Connector_Native::set(std::string const &,std::string const &,std::string const &,std::string const &,bool) swss::SonicV2Connector_Native::set(std::string const &,std::string const &,std::string const &,int const,bool)

Fixed by using python method.

[liuh-80]

Build sai redis failed because UT failed, all build failed after sunday, so not related with this PR. will keep retry and merge after it passed.

[liuh-80]

/azp run

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