Add specific dispatch for `>=` constraints.

[pedromxavier]

This PR is a first move towards avoiding bridges, as part of an initiative to better interact with JuMP's attribute system.

[codecov[bot]]

Codecov Report

Attention: 66 lines in your changes are missing coverage. Please review.

Comparison is base (a0cd57c) 80.92% compared to head (a10e4c2) 84.76%.

Files	Patch %	Lines
src/compiler/constraints.jl	69.76%	26 Missing :warning:
src/attributes/compiler.jl	87.50%	15 Missing :warning:
src/attributes/solver.jl	60.86%	9 Missing :warning:
src/compiler/variables.jl	83.87%	5 Missing :warning:
src/compiler/build.jl	72.72%	3 Missing :warning:
src/compiler/error.jl	78.57%	3 Missing :warning:
src/compiler/penalties.jl	75.00%	3 Missing :warning:
src/compiler/parse.jl	93.33%	1 Missing :warning:
src/encoding/variables/set/one_hot.jl	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #81 +/- ## ========================================== + Coverage 80.92% 84.76% +3.83% ========================================== Files 31 30 -1 Lines 1143 1385 +242 ========================================== + Hits 925 1174 +249 + Misses 218 211 -7 ```

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