Add attributes mito_name and macs_gsize to fasta asset

asset_classes/fasta_attributes_asset_class.yaml

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+name: fasta_attributes
+version: 0.0.1
+description: Sequences in the FASTA format, indexed FASTA (produced with samtools index), chromosome sizes file and attributes to Sequences in the FASTA file; mito_name (Mitocondrial chromosome name) and macs_gsize (Genome efective size).
+seek_keys:
+  fasta:
+    value: "{genome}.fa"
+    description: FASTA file
+    type: file
+  fai:
+    value: "{genome}.fa.fai"
+    description: FASTA index file
+    type: file
+  chrom_sizes:
+    value: "{genome}.chrom.sizes"
+    description: Chromosome sizes file
+    type: file
+  dict:
+    value: "{genome}.dict"
+    description: FASTA Dictionary file
+    type: file
+  mito_name:
+    value: "{params.name}"
+    description: Mitocondrial chromosome name
+    type: string
+  macs_gsize:
+    value: "{params.name}"
+    description: Genome efective size
+    type: string
+parents: 
+  - fasta

recipes/fasta_attributes_asset_recipe.yaml

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+name: fasta_attributes
+version: 0.0.1
+output_asset_class: fasta_attributes
+description:
+  Attributes to Sequences in the FASTA file. 
+  mito_name (Mitocondrial chromosome name) and macs_gsize (Genome size).
+inputs:
+  files: {}
+  params:
+    name:
+      description: Mitocondrial chromosome name
+    size:
+      description: Genome efective size
+  assets:
+    fasta:
+      asset_class: fasta
+      default: fasta
+      description: fasta asset for genome
+container: docker.io/databio/refgenie
+default_tag: ''
+command_template_list:
+test:
+  inputs:
+    name: "MT"
+    size: "2.7e9"
+  outputs:
+    mito_name:
+      value: "MT"
+    macs_gsize:
+      value: "2.7e9"