feat: add key_get series built-in operator

[MuZhou233]

Fix: #337

API changed: operator function definition changed due to different signature of key_get functions

[github-actions]

Benchmark for f4c3350

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Test	PR Benchmark	Master Benchmark	%
b_benchmark_rbac_model_large	16.5±0.21ms	10.3±0.26ms	+60.19%
benchmark priority model	5.6±0.14µs	4.3±0.11µs	+30.23%
benchmark_abac_model	2.8±0.05µs	2.5±0.04µs	+12.00%
benchmark_basic_model	4.9±0.15µs	3.9±0.15µs	+25.64%
benchmark_key_match	8.5±0.12µs	7.2±0.20µs	+18.06%
benchmark_raw	0.0±0.00ns	0.0±0.00ns	NaN%
benchmark_rbac_model	8.6±0.11µs	6.2±0.15µs	+38.71%
benchmark_rbac_model_medium	1554.0±21.76µs	858.8±16.30µs	+80.95%
benchmark_rbac_model_with_domains	6.9±0.25µs	6.0±0.09µs	+15.00%
benchmark_rbac_with_deny	13.1±0.12µs	8.4±0.08µs	+55.95%
benchmark_rbac_with_resource_roles	5.6±0.08µs	4.4±0.04µs	+27.27%
benchmark_role_manager_large	7.6±0.04ms	4.6±0.01ms	+65.22%
benchmark_role_manager_medium	583.5±7.22µs	304.7±3.85µs	+91.50%
benchmark_role_manager_small	59.8±1.67µs	29.5±0.44µs	+102.71%

[github-actions]

Benchmark for f4c3350

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
b_benchmark_rbac_model_large	10.5±0.08ms	10.1±0.03ms	+3.96%
benchmark priority model	4.3±0.04µs	4.3±0.05µs	0.00%
benchmark_abac_model	2.6±0.08µs	2.5±0.04µs	+4.00%
benchmark_basic_model	3.9±0.03µs	3.9±0.05µs	0.00%
benchmark_key_match	7.2±0.11µs	7.3±0.08µs	-1.37%
benchmark_raw	0.0±0.00ns	0.0±0.00ns	NaN%
benchmark_rbac_model	6.3±0.08µs	6.2±0.39µs	+1.61%
benchmark_rbac_model_medium	932.3±7.23µs	844.5±28.20µs	+10.40%
benchmark_rbac_model_with_domains	6.0±0.05µs	6.0±0.11µs	0.00%
benchmark_rbac_with_deny	8.7±0.05µs	8.7±0.22µs	0.00%
benchmark_rbac_with_resource_roles	4.4±0.03µs	4.4±0.09µs	0.00%
benchmark_role_manager_large	4.6±0.03ms	4.6±0.03ms	0.00%
benchmark_role_manager_medium	300.2±4.33µs	302.4±4.05µs	-0.73%
benchmark_role_manager_small	29.1±0.59µs	29.8±0.52µs	-2.35%

[github-actions]

Benchmark for f4c3350

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
b_benchmark_rbac_model_large	10.2±0.08ms	10.3±0.04ms	-0.97%
benchmark priority model	4.4±0.08µs	4.3±0.03µs	+2.33%
benchmark_abac_model	2.6±0.06µs	2.5±0.04µs	+4.00%
benchmark_basic_model	3.9±0.18µs	3.9±0.06µs	0.00%
benchmark_key_match	7.1±0.08µs	7.1±0.09µs	0.00%
benchmark_raw	0.0±0.00ns	0.0±0.00ns	NaN%
benchmark_rbac_model	6.2±0.14µs	6.3±0.15µs	-1.59%
benchmark_rbac_model_medium	878.1±9.74µs	867.9±14.48µs	+1.18%
benchmark_rbac_model_with_domains	6.1±0.09µs	6.0±0.20µs	+1.67%
benchmark_rbac_with_deny	8.6±0.15µs	9.1±0.15µs	-5.49%
benchmark_rbac_with_resource_roles	4.5±0.07µs	4.5±0.08µs	0.00%
benchmark_role_manager_large	4.6±0.04ms	4.6±0.04ms	0.00%
benchmark_role_manager_medium	302.3±4.11µs	302.6±2.67µs	-0.10%
benchmark_role_manager_small	29.7±0.40µs	29.6±0.60µs	+0.34%

[waterflier]

Great, you're so quick! I've been researching these two days and found that adding keyGet functions requires a major adjustment to the add_function system~

Thank you so much for completing it in such a short time