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Imported from GitHub PR https://github.com/openxla/xla/pull/1901

Copybara import of the project:

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9699a1333ed3bce8c34c0e8f3d1aba393263245c by David Huntsperger <dhuntsperger@google.com>:

renamed contributor guide to developer guide

Merging this change closes #1901

COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/1901 from pcoet:dev-guide 9699a1333ed3bce8c34c0e8f3d1aba393263245c
PiperOrigin-RevId: 516362984