[atable] allow modal component to be set dynamically

[Alchez]

Required for https://github.com/agritheory/fab/pull/20.

[github-actions]

Coverage Report for ./atable

Status	Category	Percentage	Covered / Total
🟢	Lines	74.09% (🎯 70%)	123 / 166
🟢	Statements	73.68% (🎯 70%)	126 / 171
🟢	Functions	72.72% (🎯 70%)	24 / 33
🔴	Branches	48.5% (🎯 70%)	65 / 134

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
atable/src/components/ACell.vue	93.33%	56.41%	100%	93.33%	75, 95, 117-120, 171
Unchanged Files
atable/src/components/AExpansionRow.vue	0%	0%	0%	0%	36-37, 40-42, 41, 44-63, 45-51, 47-49, 53-55, 54, 57-62, 1, 3
atable/src/components/ARow.vue	61.9%	57.14%	60%	61.9%	52, 59, 63, 67, 69-74, 70-73, 76-81, 12
atable/src/components/ATable.vue	88%	46.15%	100%	91.3%	156-158, 157, 157
atable/src/components/ATableHeader.vue	100%	50%	100%	100%
atable/src/components/ATableModal.vue	50%	100%	0%	50%	29
atable/src/components/index.ts	65.9%	50%	66.66%	66.66%	47-49, 48, 61, 84-86, 85, 104-116, 105-113, 106-112, 108-111, 110, 114-116, 115

Generated in workflow #351 for commit 10e701a by the Vitest Coverage Report Action