feat: allow context keys to be any type

[jponge]

Since we are going from String to Object this will not break code.

[jponge]

Not to be merged until the next minor release is in sight.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.11%. Comparing base (017da7a) to head (7ee9346).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2084      +/-   ##
============================================
+ Coverage     89.05%   89.11%   +0.05%     
- Complexity     3119     3123       +4     
============================================
  Files           412      412              
  Lines         13308    13308              
  Branches       1688     1688              
============================================
+ Hits          11852    11859       +7     
+ Misses          822      819       -3     
+ Partials        634      630       -4     

Files with missing lines	Coverage Δ
...tion/src/main/java/io/smallrye/mutiny/Context.java	91.22% <100.00%> (ø)

... and 4 files with indirect coverage changes

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