update java example for managedidentity using azure-identity library and latest dependency versions

[tristanexsquare]

Made the following changes to java example for managedidentities:

[x] Updated to java version 17
[x] using azure-identity library 1.7.3
[x] updated other dependencies to latest versions
[x] added suffix /.default to requested scope

Additional changes / cleanup:

[x] moved java classes into packages
[x] removed eclipse specific config files
[x] renamed CustomAuthenticationCallbackHandler to AzureAuthenticationCallbackHandler

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