Add rustfmt and taplo configuration files

rustfmt.toml

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+# Edition
+edition = "2021"
+
+# Comments
+format_code_in_doc_comments = true
+normalize_comments          = true
+wrap_comments               = true
+
+# Imports
+group_imports       = "StdExternalCrate"
+imports_granularity = "Crate"
+imports_layout      = "HorizontalVertical"
+
+# Miscellaneous
+enum_discrim_align_threshold = 25
+hex_literal_case             = "Upper"

taplo.toml

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+[formatting]
+align_entries       = true
+allowed_blank_lines = 1
+column_width        = 100
+reorder_arrays      = true