feat: Make cosmwasm_schema deps obsolete

[jawoznia]

This makes cosmwasm_schema dependency optional on user side, however due to how cosmwasm_schema and schemars is constructed it requires user to specify path to add some more info to macros like so:

#[cw_serde(crate = "sylvia::cw_schema")]
pub struct MyType {}

write_api! {
    crate_name: sylvia::cw_schema,

    instantiate: InstantiateMsg,
    execute: ContractExecMsg<Empty, Empty>,
    query: ContractQueryMsg<Empty, Empty>,
}

Users however can still add cosmwasm_schema to their deps and this change allows them to skip this dependency if they want to.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.12%. Comparing base (b8aa9b0) to head (05aae9d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
+ Coverage   70.10%   70.12%   +0.02%     
==========================================
  Files          53       53              
  Lines        3077     3080       +3     
==========================================
+ Hits         2157     2160       +3     
  Misses        920      920              

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[kulikthebird]

👍