feat: switch to klog v2 and structured logging

[aramase]

Reason for Change:

• Switch to using klog/v2
• Enable structured logging
• Bump dependencies and go version to 1.15
• Reorganize imports

import(
  <standard libs>

  <internal libs>

  <external libs>
)

Requirements

• squashed commits
• included documentation
• added unit tests and e2e tests (if applicable).

Issue Fixed:

fixes #245
fixes #207

Please answer the following questions with yes/no:

• Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?

Special Notes for Reviewers:

[ritazh]

lgtm

[aramase]

I1106 01:07:19.312951       1 main.go:77] Listening for connections on address: //provider/azure.sock
I1106 01:07:28.739053       1 provider.go:239] "unmarshaled key vault objects" keyVaultObjects=[{ObjectName:secret1 ObjectAlias: ObjectVersion: ObjectType:secret ObjectFormat: ObjectEncoding:} {ObjectName:secret2 ObjectAlias: ObjectVersion: ObjectType:secret ObjectFormat: ObjectEncoding:} {ObjectName:ingress-tls-pfx ObjectAlias: ObjectVersion: ObjectType:secret ObjectFormat:pfx ObjectEncoding:}] count=3 pod="default/nginx-66b6676558-79qt5"
I1106 01:07:28.739155       1 provider.go:250] "fetching object from key vault" objectName="secret1" objectType="secret" keyvault="kindkv" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:28.742429       1 auth.go:148] "using service principal to retrieve access token" clientID="c68a##### REDACTED #####e807" secret="058c##### REDACTED #####89f6" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:33.034496       1 provider.go:283] "successfully wrote file" file="secret1" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:33.034555       1 provider.go:250] "fetching object from key vault" objectName="secret2" objectType="secret" keyvault="kindkv" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:33.034736       1 auth.go:148] "using service principal to retrieve access token" clientID="c68a##### REDACTED #####e807" secret="058c##### REDACTED #####89f6" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:33.550613       1 provider.go:283] "successfully wrote file" file="secret2" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:33.550677       1 provider.go:250] "fetching object from key vault" objectName="ingress-tls-pfx" objectType="secret" keyvault="kindkv" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:33.553670       1 auth.go:148] "using service principal to retrieve access token" clientID="c68a##### REDACTED #####e807" secret="058c##### REDACTED #####89f6" pod="default/nginx-66b6676558-79qt5"
I1106 01:07:34.300845       1 provider.go:283] "successfully wrote file" file="ingress-tls-pfx" pod="default/nginx-66b6676558-79qt5"