feat: Add datasource caching functionality

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
grafana_api
\_\_init\_\_.py	0	0	100%
admin.py	160	0	100%
alerting.py	281	0	100%
alerting_notifications.py	91	0	100%
alerting_provisioning.py	228	0	100%
annotations.py	118	0	100%
api.py	74	0	100%
authentication.py	31	0	100%
correlations.py	58	0	100%
dashboard.py	176	0	100%
datasource.py	201	0	100%
external_group.py	34	0	100%
folder.py	110	0	100%
legacy_alerting.py	63	0	100%
legacy_playlist.py	55	0	100%
library.py	84	0	100%
licensing.py	26	0	100%
model.py	309	0	100%
organisation.py	151	0	100%
other_http.py	34	0	100%
playlist.py	80	0	100%
preferences.py	53	0	100%
query_history.py	70	0	100%
rbac.py	388	0	100%
reporting.py	19	0	100%
search.py	14	0	100%
service_account.py	115	0	100%
short_url.py	16	0	100%
snapshot.py	54	0	100%
team.py	105	0	100%
user.py	142	0	100%
tests/unittests
test_admin.py	346	0	100%
test_alerting.py	487	0	100%
test_alerting_notifications.py	175	0	100%
test_alerting_provisioning.py	367	0	100%
test_annotations.py	135	0	100%
test_api.py	113	0	100%
test_authentication.py	60	0	100%
test_correlations.py	111	0	100%
test_dashboard.py	362	0	100%
test_datasource.py	405	5	99%	499–505
test_external_group.py	65	0	100%
test_folder.py	204	0	100%
test_legacy_alerting.py	89	0	100%
test_legacy_playlist.py	109	0	100%
test_library.py	156	0	100%
test_licensing.py	52	0	100%
test_model.py	32	0	100%
test_organisation.py	228	0	100%
test_other_http.py	57	0	100%
test_playlist.py	167	0	100%
test_preferences.py	95	0	100%
test_query_history.py	129	0	100%
test_rbac.py	678	0	100%
test_reporting.py	25	0	100%
test_search.py	25	0	100%
test_service_account.py	173	0	100%
test_short_url.py	25	0	100%
test_snapshot.py	107	0	100%
test_team.py	218	0	100%
test_user.py	299	0	100%
TOTAL	8834	5	99%

Tests	Skipped	Failures	Errors	Time
851	0 :zzz:	0 :x:	0 :fire:	5.082s :stopwatch: