Jem Aswad Senior Music EditorFor the most part, David Bowie’s career can be divided into eras by decade — the ‘60s, when he tried almost anything to make it (Mod-pop, Buddhism, folksinging) and mostly failed; the ‘70s, when he released some of the most exciting and innovative albums in music history; the ‘80s, when he got a taste of platinum success with “Let’s Dance” and lost his muse; and the period encapsulated in the latest career-spanning boxed set, “Brilliant Adventure: 1992-2001” — when