feat: assume role provider credentials (#28)

* feat: assume role provider credentials

This commit updates the awsutil dependency to its latest version, which
supports the capability of using dynamic credentials. The storage service
was refactored to make static credentials optional. The credentials pkg
was refactored to support several attribute fields used for the assume
role provider. The host service still enforces the use of static
credentials.

go.sum

@@ -4,7 +4,7 @@ github.com/Masterminds/sprig/v3 v3.2.3 h1:eL2fZNezLomi0uOLqjQoN6BfsDD+fyLtgbJMAj
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@@ -54,7 +54,6 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
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@@ -86,7 +85,6 @@ github.com/hashicorp/eventlogger/filters/encrypt v0.1.8-0.20230428153751-cca4458
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@@ -95,8 +93,8 @@ github.com/hashicorp/go-kms-wrapping/v2 v2.0.9/go.mod h1:NtMaPhqSlfQ72XWDD2g80o8
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@@ -134,14 +132,10 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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@@ -175,7 +169,6 @@ github.com/spf13/cast v1.5.0 h1:rj3WzYc11XZaIZMPKmwP96zkFEnnAmV8s6XbB2aY32w=
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@@ -221,12 +214,9 @@ golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJ
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