feat: add sparql exec route

[djangoliv]

Related to #1173

[github-actions]

Jest Coverage Comment

Summary

Lines	Statements	Branches	Functions
	79.74% (500/627)	75.78% (216/285)	84.55% (104/123)

Coverage Report (79%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	79.74	75.78	84.55	79.7
config.js	100	96.55	100	100	4
profiles.js	94.73	95.65	94.73	95.4	138, 172–174
sources.js	62.99	54.76	75	62.69	36, 64, 93, 143, 147, 150, 173, 219–229, 238–252, 260–270, 279–293
tools.js	56.25	34.14	66.66	56.8	85–86, 123–130, 157–161, 168–171, 194–203, 228–235, 252, 266, 282, 294–349
userData.js	82.27	60.97	100	81.81	35, 43, 64, 87–88, 101–102, 116–117, 128, 135–136, 141–142
users.js	95.86	97.05	95	96.58	243–244, 263–264
utils.js	100	88.88	100	100	16, 42