feat: add promare gradient component

[hxtree]

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: -0.16%	:white_check_mark: 0.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (792ccfaf860d9c65292ee5fdb7fe117e5f70a42c) | 2256 | 1615 | 71.59% | | | Head commit (70d86afa45331f07896a14f8347ff986889e4b0f) | 2261 (+5) | 1615 (+0) | 71.43% (**-0.16%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#876) | 5 | 0 | **0.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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