feat: Implement DB backend using pebble k/v database. #8071

Job	Run time
setup	6s
Run Main (github-bot) / Go Build / generated	23s
Run Main (github-bot) / Go Lint / lint	34s
Run Main (github-bot) / Go Test / test	41s
Run Main (gnodev) / Go Build / generated	22s
Run Main (gnodev) / Go Lint / lint	1m 3s
Run Main (gnodev) / Go Test / test	1m 31s
Run Main (gnofaucet) / Go Build / generated	21s
Run Main (gnofaucet) / Go Lint / lint	35s
Run Main (gnofaucet) / Go Test / test	44s
Run Main (gnogenesis) / Go Build / generated	21s
Run Main (gnogenesis) / Go Lint / lint	51s
Run Main (gnogenesis) / Go Test / test	50s
Run Main (gnohealth) / Go Lint / lint	35s
Run Main (gnohealth) / Go Build / generated	17s
Run Main (gnohealth) / Go Test / test	35s
Run Main (gnokeykc) / Go Build / generated	17s
Run Main (gnokeykc) / Go Test / test	49s
Run Main (gnomd) / Go Lint / lint	27s
Run Main (gnokeykc) / Go Lint / lint	52s
Run Main (gnomigrate) / Go Build / generated	17s
Run Main (gnomd) / Go Build / generated	12s
Run Main (gnomd) / Go Test / test	32s
Run Main (gnomigrate) / Go Lint / lint	41s
Run Main (gnomigrate) / Go Test / test	48s
	14m 44s

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