feat: add vault secret store impl

[adohe]

What type of PR is this?

/kind feature

What this PR does / why we need it:

add vault secret store impl

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., design docs, usage docs, etc.:

[coveralls]

Pull Request Test Coverage Report for Build 7004586438

• 115 of 151 (76.16%) changed or added relevant lines in 1 file are covered.
• 14 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.1%) to 75.226%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/secrets/providers/hashivault/vault.go	115	151	76.16%

Files with Coverage Reduction	New Missed Lines	%
pkg/engine/operation/parser/parser.go	3	79.27%
pkg/engine/operation/parser/spec_parser.go	4	56.1%
pkg/cmd/apply/options.go	7	71.83%

Totals
Change from base Build 7001360289:	-0.1%
Covered Lines:	6580
Relevant Lines:	8747

---

💛 - Coveralls

[SparkYuan]

lgtm