`shell.nix`: Support `nix-shell -A` #353240

Evaluator Performance Report

stat	before	after	Δ	Δ%
cpuTime	794.94	795.53	↗ 0.60	0.08%
envs-bytes	24,399,244,560	24,399,244,560	0
envs-elements	1,297,503,320	1,297,503,320	0
envs-number	876,201,125	876,201,125	0
gc-heapSize	67,113,033,728	67,113,029,632	↘ 4,096	-0.00%
gc-totalBytes	150,701,902,848	150,701,920,544	↗ 17,696	0.00%
list-bytes	3,350,927,064	3,350,927,064	0
list-concats	90,082,137	90,082,137	0
list-elements	418,865,883	418,865,883	0
nrAvoided	1,018,695,530	1,018,695,530	0
nrFunctionCalls	804,327,047	804,327,047	0
nrLookups	419,146,443	419,146,443	0
nrOpUpdateValuesCopied	2,161,489,177	2,161,489,177	0
nrOpUpdates	103,227,118	103,227,118	0
nrPrimOpCalls	422,779,315	422,779,315	0
nrThunks	1,296,623,505	1,296,623,505	0
sets-bytes	49,505,745,472	49,505,745,472	0
sets-elements	2,903,773,871	2,903,773,871	0
sets-number	190,335,221	190,335,221	0
sizes-Attr	16	16	0
sizes-Bindings	16	16	0
sizes-Env	16	16	0
sizes-Value	24	24	0
symbols-bytes	3,349,189	3,349,189	0
symbols-number	187,298	187,298	0
values-bytes	39,623,287,512	39,623,287,512	0
values-number	1,650,970,313	1,650,970,313	0