* Base Binary Cert and CSR Parse functions.
* Add otherSANS parsing.
* Notate what doesn't exist on a CSR.
* Fix otherSans call err-checking and add basic-constriants to CSR
* Move BasicConstraint parsing to be optionally set.
* Refactored to use existing ParseBasicConstraintsExtension.
* Add handling for the ChangeSubjectName ext on CSR that is needed for EST
* Remove ChangeSubjectName - it's an attribute, not an extension, and there is no clean way to parse it, so pair down for now.
* Make these public methods, so they can be used in vault.
* Add unit tests for certutil.ParseCertificateToCreationParameters.
Also add unit tests for certutil.ParseCertificateToFields.
* Cleanup TestParseCertificate.
* Add unit tests for certutil.ParseCsrToCreationParameters and ParseCsrToFields.
* Fix return values for "add_basic_constraints" in certutil.ParseCsrToFields.
Add a test for parsing CSRs where "add_basic_constraints" is false.
* Clear up some todos.
* Add a test for certutil.ParseCertificateToCreationParameters for non-CA cert.
* Tweak TestParseCertificate/full_non_CA_cert.
* Basics of three remaining fields - keyUsage; extKeyUsage; PolicyIdentifiers
* Fix tests and err handling
* Add unit tests for policy_identifiers; ext_key_usage_oids; key_usage
* Add test on ext_key_usage_oids
* Remove duplicate usages elsewhere.
* Add error handling to csr-checks.
* Remove extranames on returned types.
* Remove useless function.
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Co-authored-by: Victor Rodriguez <vrizo@hashicorp.com>
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