Add client level symbol-to-keyword support

[povilasjurcys]

Adds automatic conversion from symbols to keywords setting:

default_client = ActiveGraphql::Client.new(url: 'http://example.com/graphql')
default_client.query(:users).select(:name).(status: :ACTIVE).to_graphql
# =>
#   query {
#     users(status: "ACTIVE") {
#       status
#     }
#   }

client = ActiveGraphql::Client.new(url: 'http://example.com/graphql', treat_symbol_as_keyword: true)
client.query(:users).select(:name).(status: :ACTIVE).to_graphql
# =>
#   query {
#     users(status: ACTIVE) {
#       status
#     }
#   }

[hound]

Some files could not be reviewed due to errors:

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml
Warning: unrecognized cop RSpec/MultipleMemoizedHelpers found in .rubocop.yml
Error: RuboCop found unknown Ruby version 3.1 in `TargetRubyVersion` parameter (in .rubocop.yml).
Supported versions: 2.3, 2.4, 2.5, 2.6, 2.7

[hound]

Some files could not be reviewed due to errors:

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml
Warning: unrecognized cop RSpec/MultipleMemoizedHelpers found in .rubocop.yml
Error: RuboCop found unknown Ruby version 3.1 in `TargetRubyVersion` parameter (in .rubocop.yml).
Supported versions: 2.3, 2.4, 2.5, 2.6, 2.7

[hound]

Some files could not be reviewed due to errors:

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml
Warning: unrecognized cop RSpec/MultipleMemoizedHelpers found in .rubocop.yml
Error: RuboCop found unknown Ruby version 3.1 in `TargetRubyVersion` parameter (in .rubocop.yml).
Supported versions: 2.3, 2.4, 2.5, 2.6, 2.7

[hound]

Some files could not be reviewed due to errors:

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml

Warning: unrecognized cop Naming/MethodParameterName found in .rubocop.yml
Warning: unrecognized cop RSpec/MultipleMemoizedHelpers found in .rubocop.yml
Error: RuboCop found unknown Ruby version 3.1 in `TargetRubyVersion` parameter (in .rubocop.yml).
Supported versions: 2.3, 2.4, 2.5, 2.6, 2.7