HTTP API issue 77,78,79 and 82,83,84,85

implement http api blockchain/with/certs and blockchain/with/actives

beceause just first block has certifications , so the result has just one element: 0 all test data don't have activities, so the response is empty I don't konw how to add test data

Closes #77 (closed) Closes #78 (closed) Closes #79 (closed) Closes #82 (closed) Closes #83 (closed) Closes #84 (closed) Closes #85 (closed)

lib/block/validation/local/membership_sig.ex

+defmodule Block.Validation.Local.MembershipSig do
+
+  # Reference material: https://git.duniter.org/nodes/typescript/duniter/-/blob/dev/app/lib/dto/MembershipDTO.ts#L118-1341
+  def fromInline(inlineMS, type, currency) do
+    [issuer, sig, blockstamp, certts, userid] = String.split(inlineMS, ":")
+    [
+      version: "10",
+      currency: currency,
+      issuer: issuer,
+      type: type,
+      blockstamp: blockstamp,
+      userid: userid,
+      certts: certts,
+      sig: sig
+    ]
+  end
+
+  # Reference material: https://git.duniter.org/nodes/typescript/duniter/-/blob/dev/app/lib/dto/MembershipDTO.ts#L86-97
+  def asRaw(kwlist) do
+    "Version: " <> kwlist[:version] <> "\n" <>
+    "Type: Membership\n" <>
+    "Currency: " <> kwlist[:currency] <> "\n" <>
+    "Issuer: " <> kwlist[:issuer] <> "\n" <>
+    "Block: " <> kwlist[:blockstamp] <> "\n" <>
+    "Membership: " <> kwlist[:type] <> "\n" <>
+    "UserID: " <> kwlist[:userid] <> "\n" <>
+    "CertTS: " <> kwlist[:certts] <> "\n"
+  end
+
+  def checkSingleMembershipSig(member, type, currency) do
+    kwlist = fromInline(member, type, currency)
+    Crypto.verify_digital_signature(kwlist[:sig], asRaw(kwlist), kwlist[:issuer])
+  end
+
+  def checkMembershipsSig([], _type, _currency) do
+    true
+  end
+
+  def checkMembershipsSig([head | tail], type, currency) do
+    checkSingleMembershipSig(head, type, currency) and
+      checkMembershipsSig(tail, type, currency)
+  end
+
+  def valid(block) do
+    checkMembershipsSig(block["joiners"], "IN", block["currency"]) and
+      checkMembershipsSig(block["actives"], "IN", block["currency"]) and
+      checkMembershipsSig(block["leavers"], "OUT", block["currency"])
+  end
+end